设P=∫0π/2sin2xdx，Q=∫0π/2cos2xdx，R=1/2∫-(π/2)π/2sin2xdx，则=()

设P=∫₀^π/2sin²xdx，Q=∫₀^π/2cos²xdx，R=1/2∫_-(π/2)^π/2sin2xdx，则=()

设P=∫₀^π/2sin²xdx，Q=∫₀^π/2cos²xdx，R=1/2∫_-(π/2)^π/2sin2xdx，则=()
A、P=Q=R
B、P=QC、P＜Q＜R
D、P＞Q＞R
【正确答案】：A

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