differentiation

Question: ${10^{ - x\,\tan x}}\left[ {\frac{d}{{dx}}({{10}^{x\tan x}})} \right]$ is equal to

1) $\tan x\, + x\,\,{\sec ^2}x$

2) $\ln \,10\,(\tan x + x{\sec ^2}x)$

3) $\ln \,10\,\left( {\tan x + \frac{x}{{{{\cos }^2}x}} + \tan x\sec x} \right)$

4) $x\tan x\,{\rm{ln}}\,\,10$

Solution:

Explanation: Explanation

standard-differentiation

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