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You can actually use either the product rule or the chain rule for this one. Observe:
• Method I:y = cos² xy = cos x · cos xDifferentiate it by applying the product rule:

The derivative of
cos x is
– sin x. So you have


—————
• Method II:You can also treat
y as a composite function:

and then, differentiate
y by applying the chain rule:

For that first derivative with respect to
u, just use the power rule, then you have

and then you get the same answer:

I hope this helps. =)
Tags: <em>derivative chain rule product rule composite function trigonometric trig squared cosine cos differential integral calculus</em>
Answer:
what do you mean dead its not breathing
Step-by-step explanation:
someone help ambulance we want <em>CPR</em>
brainly is dead
haha sorry i was just joking hehe (≧∇≦)
30×1.6=48 so the answer is 48
Answer:
It's 2^5
Step-by-step explanation:
2*2*2*2*2=32
2^5=32