Question

Sin A - 2sin^3 A / 2 cos^3 A - cos A = tanA.
Prove that ​

Answer 1

Step-by-step explanation:

given :

Sin A - 2sin^3 A / 2 cos^3 A - cos A = tanA.

Prove that

to find :

Sin A - 2sin^3 A / 2 cos^3 A - cos A

solution :

• =sin a -2sin ^3 a/ 2cos^3 a + cos a =tan a x 2(1-sin2a)/2(1-sin2 a)+1

• =sin a (1-2sin^2a)/ cos a (2cos2a+1)

• =sin a/cos a × 1-2sin2a/2cos2a+1

• =tana x1/1

• =tan a=RHS

Answer 2

Answer:

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