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OpenStudy (anonymous):
What is the derivative of sin (t/4)?
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OpenStudy (emogirlatemoooocow):
f(x)=cos(πt/4) chain rule: derivative of f(g(x))=f'(g(x))g'(x) here f(x)=cos(pi*t/4) and g(x)=(pi/4)t so g'(x)=pi/4 f′(x)=−sin(πt/4)(π/4)=−(π/4)sin(πt/4)
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