cos 75°
= cos (30+45)
= cos 30 . cos 45 - sin 30 . sin 45
= ½√3 . ½√2 - ½ . ½√2
= ¼√6 - ¼√2
= ¼√2 (√3 - 1)
semoga membantu
Cos 75 = cos (30 + 45)
= cos 45
=1/2
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cos 75°
= cos (30+45)
= cos 30 . cos 45 - sin 30 . sin 45
= ½√3 . ½√2 - ½ . ½√2
= ¼√6 - ¼√2
= ¼√2 (√3 - 1)
semoga membantu
Cos 75 = cos (30 + 45)
= cos 45
=1/2