Trigonometry HELP

[abhinv]

Hello, I have a question, which I am unable to solve.

Prove that:

cox^3x - sin^3x / cosx - sinx = 1/2 (2+sin2x)

Please help me with this..

Thanks...

 

[Deleted member 4993]

Hello, I have a question, which I am unable to solve.

Prove that:

(cox^3x - sin^3x) / (cosx - sinx) = 1/2 (2+sin2x)

Please help me with this..

Thanks...

Those parentheses are important!

Now use:

a³ - b³ = (a-b)(a² + ab + b²)