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f(x)= cos x [-π/2,π/2] rolle's theorem verify
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verify rolle's theorem for the function f(x)= x in (-1 1)
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Since cosx is continuous in [-π/2,π/2]
(2) differentiation of cosx I.e., sinx is also exist in given range.
(3) f(-π/2)= f(π/2).
Since it satisfies rolle's mean value theorm condition.
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