Indefinite IntegrationHard

Question

If x = f″(t) cos t + f′(t) sin t, y = − f″(t) sin t + f′(t) cos t, then dt is equal to-

Options

A.f′(t) + f″(t) + c
B.f″(t) + f″(t) + c
C.f(t) + f″(t) + c
D.f′(t) − f″(t) + c

Solution

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