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Syllabus

What is componendo and dividendo method? Plz explain.

Can you pls find the value of Tan(-2025).

My answer was -1....Am i right???

cot(2pi+x)=?

cos20.cos40.cos80=1/8

Prove that.....Tan 70 = tan 20 + 2 tan 50...

Solve Sinx + Sin3x + Sin5x = 0.

if B+C =60' show that

sin(120-B)=sin(120-C)

sin 20 sin 40 sin 60 sin 80=3/16

Prove:Cos18+Sin18/Cos18-Sin18 = Tan63Please provide me the answer for this question as soon as possible...

solution of ml agarwal for isc 11std

The chapter trigonometry in RS Aggarwal book (of class 11th) is divided into 6 sub-chapters. But its chapter 5 ( Solution of triangles ) and 6 ( Graphs of trigonometric functions ) are not the topics of NCERT Book.

Now my question is:

Should I study these two chapters (5 &6 of RS Aggarwal) as these are not in NCERT Book?Prove that sin(a) + sin(a+h) + sin(a+2h) +.........+ sin(a+(n-1)h) =

(sin(nh/2) sin(a+(n-1)h/2)/sin(h/2)prove the following :

root 3 cosec 20 - sec 20 = 4

prove that tan20 .tan40.tan80=tan60.

?

sin

^{4}x+cos^{4}x=1-2sin^{2}xcos^{2}xcos

^{2}x + cos^{2}(x + pi/3) + cos^{2}(x - pi/3) = 3/2. proveThe large hand of a big clock is 70 cm long.How many cms. does it's extremely move in 6 minutes time.

cotx cot2x - cot2x cot3x-cot3x cotx=1

In a circle of diameter 60 cm the length of a chord is 30 cm. Find the length of the minor and the major arcs of the chord. { hint: Triangle OAB being equilateral theta=60 degrees=pie/3 rad

Now minor arc AB=r theta

Also major arc = 2 pie r - minor arc}

sinA . sin(60-A) . sin(60+A) = 1/4 sin3A

Find the principal solution of sinx = - root3/2

if sin alpha + sin beta= a and cos alpha + cos beta= b, show that

1. Sin(alpha+beta)= 2ab/a sq.+b sq.

2. Cos(alpha+beta)= b sq.-a sq./b sq.+a sq.

prove that cos20 cos 40 cos 60 cos 80=1/16.

minimum value of sec square theta + cosec square theta

prove that cos 10.cos30.cos50.cos70 = 3/16

prove that cos^2 x + cos^2 y - 2cosx cosy cos (x+y) = sin^2(x+y)

prove that tan 50 = 2 tan 10 + tan40

1.(1+cos pi/ 8) (1+cos 3pi / 8) (1+cos 5pi / 8) (cos 7pi / 8)=1/8

prove that:tan 2a -tan a =tana* sec 2a

Prove that sin3x + sin 2x – sinx = 4 sinx cos x/2 cos3x/2

sin10*sin50*sin70=1/8?

sin 105 degree +cos 105 degree =cos 45 degree

Prove the following: cosA / 1 - sinA = tan (45 + A/2)

Find the maximum and minimum values of sin^4x + cos^2x and hence or otherwise find the maximum value of sin^1000 x + cox^2008 x

prove :- cos 12 cos 24 cos 48 cos 84 = 1/16

cos4 pi /8+ cos4 3pi /8+ cos4 5pi /8 +cos4 7pi/ 8=3/2 prove it fast rely plssss

sin

^{2}A + sin^{2}(A+pi/3) + sin^{2}(A-pi/3) = 3/2PROVE THAT

cos

^{3}A + cos^{3}(120+A) + cos^{3}(240+A) = 3/4 cos3A2sin6 + cosec 7pi/6 cos^{2}pi/^{2}pi/3=0cos4 pi / 8+cos4 3pi /8 + cos4 5pi / 8 +cos4 7pi /8 =3/2

a) Choose the possible values of cosec x from the bracket. {-3/5 ,3/5 ,5/3, -5/3 }

b)Evaluate tan x sec x for the x in part (a)

if A+B=45 degree.show that {1+tanA}{1+tanB}=2

Prove that:

4 cosA cos(60-A) cos(60+A) = cos3A

in any triangleABC P.T

(b

^{2}-c^{2})cotA + (c^{2}-a^{2})cotB + (a^{2}-b^{2})cotC = 0Prove cos5x=16cos

^{5}x-20cos^{3}x+5cosxprove that cos11+sin11/cos11-sin11=tan56

if cosA=5/13, Find the value of sin2A ,cos2A,tan2A

provided 0<A<90

prove using sine rule - 1) sin ( B-C)/2 = b-c/a cos ( A/2)

2)1+cos(A-B) cos C / 1+cos(A-C) cos B = a2+ b2/ a2- c2

3) (b-c)cot (A/2) + (c-a)cot (B/2) + (a-b)cot (C/2) = 0

4) a cos(B-C/2) = (b+c) sin(A/2)

5) c/(a-b) = tan(A/2) + tan(B/2) / tan(A/2) - tan(B/2)

6) a(cos C - cos B) = 2(b-c) cos^2 (A/2)

show that tan3x-tan2x-tanx =tan3x*tan2x*tanx

prove that

tan (A+30) + cot (A-30)=1/(sin2A-sin60)

IF cos(alpha + beta) = 4/5 and sin(alpha - beta) = 5/13

FIND THE VALUE OF tan 2 alpha, where 0 is less than equal to alpha is less than equal to pie/4.

plz reply!!

find the general solution for 2sinx +root3 cosx =1+ sinx

Prove that tan4x= (4tanx(1-tan^2x)) / 1-6tan^x+tan^4x

a tree stands vertically on a hill side which makes an angle of 15degree with the horizontal. from a point on the ground 35m down the hill from the base of the tree, the angle of elevation of the top of the tree is 60degree. find the height of the tree.

ans(35root2m) plese tell the xact solution

Solve the equation:

4sinxcosx + 2sinx + 2cosx + 1 = 0

evaluate the following;

a)cos 1050 degree

b)cosec (-585 degree)

c)cot 495 degree

d)tan 120 degree

Show that cos 24 + cos 55 + cos 125 + cos 204 + cos 300= 1/2

prove-

cos

^{2}(pi /8) + cos^{2 (}3pi / 8) +cos^{2}(5pi / 8) +cos^{2 (}7pi / 8) = 2how the formula sin(2npi+x)=sinx came.why was 2npi avoided

If A+B+C = pai, prove that

sinA + sinB + sinC = 4 cosA/2 cosB/2 cosC/2

find the derivative of cotx by the first principle?

Prove that cotA/2-tanA/2=2cotA

The angles of a triangle are in AP and the ratio of the number of degrees in the least to the number of radians in the greatest is 60:

π. Find the angles in degrees and radians.

prove sin

^{2}A - sin^{2}B/sinA .cosA- sinB. cosB = tan(A+B)Prove that: cosA cos2A cos4A cos8A =sin16A / 16sinAPlease explain working

prove that 1+cos2x+cos4x+cos6x= 4cosx cos2x cos3x.

cosec x- cosec 2x = cosec4x

EVALUATE cos(-1125)

Solve sin2x+sin4x+sin6x=0

If tanx = 1/7

Tany =1/3

Prove that :- Cos2x = Sin4y

prove that

cos20cos40cos60cos80 =1/16