Which of the following is equal to secA - cosA?
A. tanA.sinA
B. cosA.sinA
C. cotA.cosA
D. sinA.cotA
Answer: Option A
Solution (By Examveda Team)
$$\eqalign{ & \sec A - \cos A \cr & = \frac{1}{{\cos A}} - \cos A \cr & = \frac{{1 - {{\cos }^2}A}}{{\cos A}} \cr & = \frac{{{{\sin }^2}A}}{{\cos A}} \cr & = \tan A.\sin A \cr} $$This Question Belongs to Arithmetic Ability >> Trigonometry
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