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Typeals Dream college ), Prove that (Prove that) sines "cos / 15 (sin10 with ORO

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Prove that sin A/1+cos A = 1-cos A/sin A

Prove that cos2A=cos^2 A -sin^2 A

Prove that: sin 40^0+sin 20^0=cos 10^0

Prove that: sin(pi/10). cos(pi/5)=1/4

Prove that sin (A+B)= sin A cos B + cos A sin B.

Prove that sin105^@+cos105^@=cos45^@

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Prove that sin75^o -sin15^o =cos105^o +cos15^o

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