Question

tan–1 x + tan–1y =π+tan-1 (x+y/1-xy)
solve by using 5th property of inverse trigonometry
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Answer 1

Answer:

-tan(x)-π×tan(y)-tan(-1)×(x+y)

Multiply

Use symmetry

Simplify using symmetry of trigonometric function

Reprder the terms

Final solution

I hope it can help (◍•ᴗ•◍)