Q.
Let f(x)=2−sinx2+cosxStatement-1: The antiderivative of f is a periodic functionof period π.Statement-2: The period of the functiong(x)=log(2+cosx)+Atan−1(Btanx/2)+C,A,B,C being contants is 2π.
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a
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
b
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation forSTATEMENT-1
c
STATEMENT-1 is True, STATEMENT-2 is False
d
STATEMENT-1 is False, STATEMENT-2 is True
answer is D.
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Detailed Solution
F(x)=2I1+I2,I1=∫dx2+cosx and I2=−∫sinx2+cosxdx=log(2+cosx)+ constant. I1=∫2dt1+t22+1−t21+t2=2∫dt3+t2=23tan−113tan(x/2)+C (t=tan(x/2))Hence F(x)=log(2+cosx)+43tan−113tan(x/2)+C which is periodic with period 2π.
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