February 2019 1 87 Report
Jika sin x = 1 √5 / 5dan sudut x lancip,
maka nilai dari
cos x - 5 cos ( phi / 2 + x ) - 2 sin ( phi + x )
Adalah ...
a. -6√5 / 5
b. -√5
c. 2√5 / 5
d. √5
e. 9√5 / 5

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