cos 70°/sin20°+cos59°/sin31°=8sin^2 30°
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Step-by-step explanation:
cos 70/sin20+cos59/sin31=8sin^2 30
cos(90-20)/sin20+cos(90-31)/sin31=8sin^2 30
=> sin20/sin20+sin31/sin31=8sin^2 30
=> 1+1=8(1/2)^2
=>2=8(1/4)
=>2=2
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