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Q.

The equation of the line tangent to the curve xsiny+ysinx=πatthepointπ2,π2  is

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a

3x+y=2π

b

x-y=0

c

2x-y=π2

d

x+y=π

answer is D.

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Detailed Solution

xsiny+ysinx=πDifferentiatingw.r.t.x,wegetsiny+xcosydydx+dydxsinx+ycosx=0Whenx=π2andy=π2,wehave1+dydx=0y'=-1Therefore,theequationofthetangentlineisy-π2=-x-π2orx+y=π

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