高数,求解,请写出详细过程,谢谢啦
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∫(5π/4,π/4)(1+sin²x)dx
=∫(5π/4,π/4)[1+½(1-cos2x)]dx
=∫(5π/4,π/4)(3/2)-½cos2x)dx
=(3/2)x|(5π/4,π/4) -¼sin2x|(5π/4,π/4)
=3/2(5π/4-π/4)-1/4(sin5π/2-sinπ/2)
=3π/2
=∫(5π/4,π/4)[1+½(1-cos2x)]dx
=∫(5π/4,π/4)(3/2)-½cos2x)dx
=(3/2)x|(5π/4,π/4) -¼sin2x|(5π/4,π/4)
=3/2(5π/4-π/4)-1/4(sin5π/2-sinπ/2)
=3π/2
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