Question

The expression (tanx+cotx)^2 is the same as _____
a.tan^2x+cot^2x
b.sec^2x+csc^2x
c.sec^2x+cos^2x
d.cos^2x+sin^2x

Answer 1

Expanding gives\[(\tan x+\cot x)^2=\tan^2x+2+\cot^2x\]
Use some identities to rewrite this.