cos²33°-cos²57÷sin21°-cos21°
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[ (cos33-cos57)(cos33+cos57)]/(sin21-cos21...
=[-2sin45sin(24)*2cos45cos24]/(cos69-c...
=[-4*1/2*sin24cos24]/(-2sin45sin48)
=[-2sin24cos24]/(-2/√2sin48)
=[√2 sin48]/2sin48
=1/√2
2) sin51+sin9
=2sin30*cos42
=cos
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