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KCET 2010 Math Solved Paper

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Question : 40

Total: 60

The derivative of eax‌Cos‌b‌x with respect to x is reax‌Cos(bx+Tan−1‌

). When a>0,b>0, the value of r is ..........................

ab
a+b
√a2+b2
‌
1
√ab

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