Need answers ....QUICKLY

Need answers ....QUICKLY 20 TRIGONOME JO Lach Question carries two mares — O then 'ind the O • cos • Z If A, B and C are interwor angles Of a ABC. then find tan — a. if tano • Sino •m and tane• sino n show that m; 5 + —A1 • m90- COS 20 • COS 70 tanAcot.A 6. If cos A cos B - sin A sin B find the value Of cos 1050 7 If 3 sin A 2 cos A 3 find the value Of tan A. cosec A g Ifx= a sec o + b tan o and tan o —b If sino + sin o —1 prove that cos'o • cos•o O Find the value Of o if 2 20 €3

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3) cosA1-sinA+cosA1+sinA=(1+sinA)cosA+cosA(1-sinA)(1-sinA)(1+sinA)=cosA+sinAcosA+cosA-sinAcosA1-sin2A=2cosAcos2A   sin2x+cos2x=1=2cosA=2secA
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