TOLONG DI JAWAN SEGERA YA!! tentukan harga cos 150°+sin 54°+ costan (-330°)?

Jawaban :
cos 150° + sin 45° + 1/2 cot (-330°) = .....

cos150°= -cos30=- 1/2 √3
sin 45° = 1/2 √2
cot (-330°) =-cot330°= cot 30°= √3

=- 1/2 √3 + 1/2 √2 + 1/2 × √3
=- 1/2 √3 + 1/2 √2 + 1/2√3
= 1/2 √2


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