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sin 15 derajat = sin (45-30)
= sin45 cos30 – sin30 cos45
= √2/2 . √3/2 - 1/2 . √2/2
=√6/4 - √2/4 = √6 - √2
4
maaf ya nomor 1 nya gk bisa
2. Sin 15 = Sin ( 60-45 ) = Sin 60 Cos 45 - cos 60 sin 45
= 1/2 1/2 - 1/2. 1/2
= 1/4 - 1/4
= 1/4 ( - )