Answer:
Step-by-step explanation:
Attached is a short table of trig function values. There are really only three you need to remember if you keep an image of the sine and cosine graphs in your head (for 0° and 90° values).
sin(α) = cos(90°-α)
tan(α) = sin(α)/cos(α)
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sin(30°) = cos(60°) = 1/2 . . . . . . . the answer to this question
sin(45°) = cos(45°) = 1/√2 = (√2)/2
sin(60°) = cos(30°) = (√3)/2
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I find it just as easy to remember SOH CAH TOA and the side ratios in isosceles and half-equilateral right triangles: 1:1:√2 and 1:√3:2, respectively.
