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y = 2
r = 3
maka
x = √(3² - 2²)
x = √5
cos a = x/r = √5/3
tan a = y/x = 2/√5
2 tan a = 4/√5
cos a + 2 tan a = √5/3 + 4/√5
= (5 + 12)/3√5
= 17/15 √5