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If I1=int0^(3pi) (cos^2x) dx and I2 =int...

If `I_1=int_0^(3pi) (cos^2x) dx` and `I_2 =int_0^pi (cos^2x) dx` then
(a)` I_1=I_2` (2) `I_1=2 I_2` (3) `I_1=5I_2` (4) `I_1=3I_2`

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