Question

Prove that
Cos^3 theta - Cos 3theta/
Cos theta+
Sin^3 theta+Sin 3theta
Sin theta = 3​

Answer 1

Answer:

hope this help..................

Answer 2

Answer:

cos3x=4cos^3x-3cosx

cos^x-cos3x=3cosx-3cos^3x

sin3x=3sinx-4sin^3x

sin3x+sin^3x=3sinx-3sin^3x

substituting these both in numerator

we get

3(1-cos^2x)+3(1-sin^x)

6-3=3