differenciate e^x/cosx
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dy/dx = e^x / cosx
= diff w. r. t. x
cosx d/dx(e^x) -e^x d/dx(cosx)
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cos²x
= e^x cosx + e^x sinx
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cos²x
= e^x ( cosx + sinx)
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cos²x
this is the final answer.
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