Question

Prove this trigonometrical identity :

tanA              cotA
---------      + ----------   ==  secAcosecA + 1
1 - cotA         1 - tanA


for better understanding, see the picture attached

Answer 1

first convert whole the LHS with respect in SinA and CosA. then when you will get a equation in cubic form use the for of a3-b3 (3=degree 3). you will hav something as common after that u will get ur proof=RHS.