定积分π/2到π/6 cos^2x dx
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定积分π/2到π/6 cos^2x dx
定积分π/2到π/6 cos^2x dx
定积分π/2到π/6 cos^2x dx
∫(π/2 to π/6) cosx dx =(1/2)∫(π/2 to π/6) (1+cos2x) dx =(1/2)(x+1/2*sin2x) (π/2 to π/6) =(1/2)(√3/4+π/6-π/2) =√3/8-π/6