问题标题:
已知cos(θ+π2)=-12,求cos(θ+π)sin(π2−θ)[cos(3π−θ)−1]+cos(θ−2π)cos(−θ)•cos(π−θ)+sin(θ+5π2)的值.
问题描述:

已知cos(θ+π2)=-12,求cos(θ+π)sin(π2−θ)[cos(3π−θ)−1]+cos(θ−2π)cos(−θ)•cos(π−θ)+sin(θ+5π2)的值.

赖翔飞回答:
  ∵cos(θ+π2
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