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It isn't. The derivate of sin x = cos x.

It isn't. The derivate of sin x = cos x.

It isn't. The derivate of sin x = cos x.

It isn't. The derivate of sin x = cos x.

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βˆ™ 15y ago
This answer is:
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βˆ™ 15y ago

It isn't. The derivate of sin x = cos x.

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Q: Why does the derivative of sin x equal - cos x?
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When does cos x equal -sin x?

The derivative of cos(x) equals -sin(x); therefore, the anti-derivative of -sin(x) equals cos(x).


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What is the second derivitive of sec x?

Write sec x as a function of sines and cosines (in this case, sec x = 1 / cos x). Then use the division formula to take the first derivative. Take the derivative of the first derivative to get the second derivative. Reminder: the derivative of sin x is cos x; the derivative of cos x is - sin x.