4 If a = 3 + b, then a3-b3-9ab is: 1 9 2 27 3 - Maths - Circles

Question

4 If a = 3 + b, then a 3 - b 3 - 9 a b   i s :
1 9
2 27
3 81
4 18

10 In the figure chord AB and CD when produced meet at point P If
∠ A O C = θ ,   ∠ B O D = α then prove
that ∠ A P C = θ - α 2
(O is the centre of the circle)

Rishabh Mittal · Accepted Answer

Dear Student ,

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4. If a = 3 + b, then a 3 - b 3 - 9 a b i s : 1. 9 2. 27 3. 81 4. 18 10. In the figure chord AB and CD when produced meet at point P. If ∠ A O C = θ , ∠ B O D = α then prove that ∠ A P C = θ - α 2 . (O is the centre of the circle)

4. If a = 3 + b, then $a^{3} - b^{3} - 9 a b i s :$
1. 9
2. 27
3. 81
4. 18

10. In the figure chord AB and CD when produced meet at point P. If $∠ A O C = θ, ∠ B O D = α$ then prove that $∠ A P C = \frac{θ - α}{2}$ .
(O is the centre of the circle)