Trigonometryeasy · Past Paper
The value of cos 60 degrees is the same as the value of:
Asin 30 degrees
Bsin 60 degrees
Ctan 30 degrees
Dsec 60 degrees
✓ Correct Answer: A — sin 30 degrees
Using complementary angles: cos(x) = sin(90-x). cos 60 = sin(90-60) = sin 30.
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