find nth derivative of y = cos4x
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So,
Derivative of
is 
Step-by-step explanation:
Given,
Find Derivative of
Differentiate with respect to ,
⇒
⇒
⇒ (∵
)
Again differentiate,
⇒
⇒
Similarly,
⇒
∴ differentiate is,
∴
∴ Derivative of
is
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