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Evaluate:`inttan^4x dx` |
Answer» `int tan^(4)xdx=int tan^(2)x tan^(2)xdx=int tan^(2)x(sec^(2)x-1)dx` `=int tan^(2)x sec^(2)xdx-int tan^(2)xdx=(sec^(3)x)/(3)-int(sec^(2)x-1)dx` `=(sec^(3)x)/(3)-tanx+x+C` |
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