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sin 50 = cos 40
cos 50 = sin 40
.
= (cos 40 - cos 20)/(sin 40 - sin 20)
= [ - 2 sin 30 sin 10 ] / [2 cos 30 sin 10]
= - sin 30/cos 30
= - tan 30
= - (1/√3)
= - 1/3 √3