Simplify: cos220+cos270sin220+sin270+cos(20+θ)sin(70θ)


Answer:

1

Step by Step Explanation:
  1. cos220+cos270sin220+sin270+cos(20+θ)sin(70θ)=cos220+sin220sin220+cos220+cos(20+θ)sin(90(20+θ)){sin(90θ)=cosθ and cos(90θ)=sinθ=cos220+sin220sin220+cos220+cos(20+θ)cos(20+θ)=1+0=1

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