Question

sin³theta upon cos theta plus cos ³theta upon sin theta is equal to 2cot2theta​

Answer 1

Answer:

Solution:

LHS =

=

=

=

=

/* we know the algebraic identity:

a³-b³ = (a-b)(a²+ab+b²) */

=

After cancellation, we get

=

/* We know the Trigonometric identity:

sin²A + cos²A = 1 */

= $1+sin\theta cos\theta$

= RHS