InterviewSolution
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InterviewSolution
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Find the derivative of the following functions (it is to be understand that a,b,c,d,p,q,r and s are fixed non-zero constants and m and n are integers): `(a)/(x^(4))-(b)/(x^(2))+cosx` |
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Answer» Let `y==(a)/(x^(4))-(b)/(x^(2))+cos x` `=a.x^(-4)-b.x^(-2)+cos x` `rArr(dy)/(dx)=(d)/(dx)(ax^(4)-bx^(-2)++cos x)` `=a(d)/(dx)x^(-4)-b(d)/(dx)x^(-2)+(d)/(dx)cos x` `=a(-4)x^(-5)-b(-2)x^(-3)+(-sin x)` `=(-(4a)/(x^(5))+(2b)/(x^(3))-sinx)` |
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