如图求解答。
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原式=∫(π/4,π/2)cot²tdt
=∫(π/4,π/2)(csc²t-1)dt
=(-cott-t)|(π/4,π/2)
=(0-π/2)-(-1-π/4)
=-π/2+1+π/4
=1-π/4
=∫(π/4,π/2)(csc²t-1)dt
=(-cott-t)|(π/4,π/2)
=(0-π/2)-(-1-π/4)
=-π/2+1+π/4
=1-π/4
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