misha1227
integral of 1/( e^(t+y) ) dy...?



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imranmeah91
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equal
integral of e^(t+y) = e^(ty)

imranmeah91
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u=(ty)
du dy

A7med
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=1/(e^(t+y))

misha1227
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what would du be if u = ty..?

imranmeah91
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1

misha1227
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is it 1dy..?

imranmeah91
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dy

imranmeah91
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t is constant so its derivative is 0

misha1227
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oo gosh ofcourse..thanks you!

A7med
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e^(t+y) = e^t * e^y
hint

A7med
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and because e^t is a constant you can take it out of the integral and work with e^y