Simplify cos210+cos280sin210+sin280+sin(90θ)sinθtanθ+cos(90θ)cosθcotθ


Answer:

2

Step by Step Explanation:
  1. cos210+cos280sin210+sin280+sin(90θ)sinθtanθ+cos(90θ)cosθcotθ=cos210+cos2(9010)sin210+sin2(9010)+cosθsinθtanθ+sinθcosθcotθ{sin(90θ)=cosθ and cos(90θ)=sinθ=cos210+sin10sin210+cos210+cosθsinθtanθ+sinθcosθcotθ=1+cos2θ+sin2θ=1+1=2

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