[MP PET 1997]
A) $ \sec x\tan x $
B) $ \sec x^{o}\tan x^{o} $
C) $ \frac{\pi }{180}\sec x^{o}\tan x^{o} $
D) $ \frac{180}{\pi }\sec x^{o}\tan x^{o} $
Correct Answer: C
As $ x^{0}=\frac{\pi x}{180} $ radian.
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