Act Math Practice
Trigonometry Answer 1
Trigonometry Answer 1:
1. Consider the laws of sines and cosines.
(sin A)2 = ?
A. 1 - (cos A)2
B. (cos A)2 - 1
C. (tan A)2
D. 1 - (tan A)2
E. (tan A)2 - 1
The correct answer is A.
Remember the following formulas. They are valid with respect to any angle:
sin2 + cos2 = 1
cos2 = 1 - sin2
sin2 = 1 - cos2
Therefore, sin2 is always equal to 1 - cos2.
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