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If g(x)=0xcos4 t dt then g(x+π) equals

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a
g(x)+g(π)
b
g(x)–g(π)
c
g(x) g(π)
d
g(x)/g(π)

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detailed solution

Correct option is A

g(x+π)=∫0x+π cos4⁡ t dt=∫0π cos4⁡ t dt+∫πx+π cos4⁡ t dt=g(π)+I1In I1, put t=π+u, so that I1=∫0x cos4⁡ (π+u)du=∫0x cos4⁡ udu=g(x).


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