find the value of cos 75 degree
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can 30 is 1/√2""""""""""""""
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Cos75°
=cos(45°+30°)
=cos45°.cos30° - sin45°. sin30°
=1/ √2. √3/2 - 1/ √2. 1/2
= √3/2 √2 - 1/2 √2
= √3-1/2 √2
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