For d/dx (cos 4x + sin^(4) x)(adsbygoogle = window.adsbygoogle || []).push({});

is it.

-sin(4x)(4) + cos^4 (x)??? I was unsure on how to approach sin^4. Thanks.

Also for d/dx (1)/(16-t^2)^(1/4)

Is this correct: (-1/4 (16-t^2)^(-5/4))\((16-t^2)^(1/4))^2??

Thank you.

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# Unsure on how to approach sin^4

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