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CBSE Class 12 Math 2009 Solved Paper

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Question : 11 of 29
Marks: +1, -0
Differentiate the following function w.r.t. x:
y = (sinx)x+sin1x(sinx)^x+sin^{-1}√x
Solution:  
y = (sinx)x+sin1x(sinx)^x+sin^{-1}√x
Let u = (sinx)x(sinx)^x and v = sin1xsin^{-1}√x
Now y = u + v
dy/dx{dy}/{dx} = du/dx+dv/dx{du}/{dx}+{dv}/{dx} ... (i)
Consider u = (sinx)x(sinx)^x
Taking logarithms on both the sides, we have,
logu = xlog (sin x)
Differentiating with respect to x, we have,
1/u.du/dx1/u . {du}/{dx} = log (sin x) + x/sinxx/{sinx} . cos x
du/dx{du}/{dx} = (sinx)x(sinx)^x (log (sin x) + x cot x) ... (ii)
Consider v = sin1xsin^{-1}√x
dv/dx{dv}/{dx} = 1/1x1/√{1-x} × 1/2x1/{2√x} ... (iii)
From (i), (ii) and (iii)
We get , dy/dx{dy}/{dx} = (sinx)x(sinx)^x (log (sinx) + x cot x) + 1/2x1x1/{2√x√{1-x}}
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