If sin(theta) = 3/5, what is cos(theta) for an acute angle theta?

Topic: Trigonometry
Subtopic: Ratios

A3/4

B4/5

C5/4

D4/3

Explanation

In a right triangle, Opposite = 3, Hypotenuse = 5 => Adjacent = sqrt(5^2 – 3^2) = 4. cos(theta) = Adjacent / Hypotenuse = 4/5.

Exam Relevance

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