Question

prove 2tan^-1 1/5+tan^-1 1/8=tan^-1 4/7 ​

Answer 1

Step-by-step explanation:

Hello

the sum has very big steps but I will tell you that to put the values in this formula. hope so it helps you.

first you have to take LHS and then put the values in this formula

• 2tan^-1 x= tan^-1 (2x/1-x^2)

then after completing this then put another formula

• tan^-1x + tan^-1y = tan^-1 ( x+y/ 1-xy)