f(t)= (1-t)^(1/2)

chain rule f'(t)= 1/2(x)^(-1/2)dx x= 1-t dx= -1 f'(t)= 1/2(1-t)^(-1/2)(-1) f'(t)= (-1/2)(1-t)^(-1/2) f'(t)= -1/(2sqrt1-t)

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