Prove that Tan15°+Cot15°=4

1.	Prove that Tan15°+Cot15°=4
Answer» Tan(45-30)=tan45-tan30/1+tan45.tan30=(1-1/root 3)/(1+1/root 3)=root 3-1/root 3+1. .......1 similarly,cot(45-30)=root 3+1/root3-1. ........2Now by adding 1&2 we get 4

Discussion