1) '=8(3x^9-4)^7 * (3x^9-4)' = 8(3x^9-4)^7 * 9x^8
2) '=7*5x^6-2*3x-4=35x^6-6x-4
3) '=(e^x)'*Cosx + e^x * (Cosx)' = e^x*cosx - e^x*Sinx
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Answers & Comments
1) '=8(3x^9-4)^7 * (3x^9-4)' = 8(3x^9-4)^7 * 9x^8
2) '=7*5x^6-2*3x-4=35x^6-6x-4
3) '=(e^x)'*Cosx + e^x * (Cosx)' = e^x*cosx - e^x*Sinx