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Sin angle = 3 / 5, angle in (Pie / 2, pie), find cos angle equal to
one hundred and forty-three
Cos α is equal to - 4 / 5, α is the angle of the third term, and the value of sin (3 π / 4 - α) and COS (π / 4 + 2 α) can be obtained
Cos α = - 4 / 5, α is the third quadrant angle
sinα=-√(1-cos^2α)=-3/5
sin(3π/4-α)=sin3π/4cosα-cos3π/4sinα=-7√2/10
cos(π/4+2α)=cosπ/4cos2α-sinπ/4sin2α=√2/2(cos^2α-sin^2α-2sinαcosα)=-7√2//50
What degree angle of COS is equal to 0.14?
81°57′
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