When , tan x is negative. So, square root of tan2 x in this condition is –tan x.So, =tan-1 (-tan x)=-tan-1 (tan x)=-xAnd so (Ans)

Q15 of 354 Page 11

If and find .

When , tan x is negative. So, square root of tan² x in this condition is –tan x.

So,

=tan^-1 (-tan x)

=-tan^-1 (tan x)

=-x

And so

(Ans)

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