My text book did the following without giving an explanination. If anyone can fill me in it would be much appreciated.(adsbygoogle = window.adsbygoogle || []).push({});

the integration of (1+2*sin(x)^2)^2 from pi+pi/6 to pi+(3*pi)/6 is equal to

the integration of (1-2*sin(x)^2)^2 from pi/6 to (3*pi)/6.

thanks

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# Integration question

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