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Speak With a Friendly Mentor. ###### Deepak Patra posted an Question
February 06, 2022 • 15:43 pm 30 points
• IIT JAM
• Mathematics (MA)

# Let a, b e r and f: r r be defined by f(z) =a cos(|a - al) +b|æ| sin (|+). then f is (1) differentiable at a = 0 ifa =0 and b =1 (2) differentiable at r = 1 ifa

Let a, b e R and f: R R be defined by f(z) =a cos(|a - al) +b|æ| sin (|+). Then f is (1) differentiable at a = 0 ifa =0 and b =1 (2) differentiable at r = 1 ifa =1 and b =0 (3) NOT differentiable at a = 0 if a = 1 and b = 0 (4) NOT differentiable at a = 1 ifa = 1 and b = 1

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• ##### Deepak singh 1

Refer attachment

sir please check option a ... i think its differentiable ?????

yes , you are right , option a is also correct . Ignore my option a statements .

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