sin70-cos40/cos50-sin20
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=sin70-sin50/cos50-cos70
=2cos(70+50) sin(70-50) / 2sin(70+50) sin(70-50)
=2cos120° sin20° / 2sin120° sin20°
=2*(-1/2) / 2(√3/2)
=-1/√3
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