Maths

What is the value of cos225+sin165

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asked by Aliya
  1. that would be the same as
    -cos45 + sin15
    = -1/√2 + (√3-1)/2√2 = (-2+√3-1)/(2√2) = 1/2 (√3-3)/√2 = 1/4 (√6-3√2)

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