ddxtan-11+cosx21-cosx2 is equal to
-14
14
12
-12
Explanation for correct option:
Step-1: Simplify the given data.
Given, ddxtan-11+cosx21-cosx2
=ddxtan-12cos2x42sin2x4=ddxtan-1cotx4=ddxtan-1tanπ2-x4=ddxπ2-x4
Step-2: Differentiate w.r.t x.
=0-14×1=-14
Hence, correct answer is option A
Solve for x:x−23=2x7
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