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*(d)r cos(x)drHint: Rewrite the integrand as rr cos(x). Now experiment as to what to set u and duequal to. Do not use online resources!
*(d)r³ cos(x²)drHint: Rewrite the integrand as r²r cos(x²). Now experiment as to what to set u and duequal to. Do not use online resources!
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