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Yuki888 [10]
2 years ago
7

Rewrite the expression as an algebraic expression in x. cos(tan−1 x)

Mathematics
1 answer:
zhenek [66]2 years ago
7 0
It's hard to type and hard to read the "inverse tangent" function, as you've seen (above).

So, use "arctan x" instead.

Then the problem becomes:  "differentiate cos (arctan x)."

You must apply first the rule for differentiating the cosine function, and next apply the rule for differentiating the arctan function:

(d/dx) cos (arctan x) = - sin (arctan x) * [1/(1+x^2)]

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