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The least value of the expression `y=(1)/((3sin^(2)x + 3 sin x cos x + 7 cos ^(2)x))` is equal toA. `(2)/(15)`B. `(2)/(5)`C. `(2)/(3)`D. `-(2)/(5)` |
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Answer» `I_(n) = inte^(-x)s^(n)` `I_(n) = intn.(s)^(n-1).c.e^(-x)dx` `I_(n) = n(s)^(n-1).c.e^(-x)(-1)]_(0)^(oo)+int(n(n-1)s^(n-2).c^(2)-ns^(n))e^(-x)dx` `I_(n) = int(n(n-1).S^(n-2)-n(n-1)s^(n)-n.s^(n))e^(-x)dx` `I_(n) =n(n-1).I_(n-2)-n^(2).I_(n)` `I_(n) =(n(n-1))/(1+n^(2)).I_(n-2)` |
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