If sinx is approximately 0.2588, what is the measurement of x to the nearest degree? Approximately, what is the cosine of the angle that is complementary to x?
x = sin-1(0.2588) ≈ 15°
The cosine of the complementary angle to x is always equal to the sine of x. (Complementary angles sum to 90°).
To clarify: cos(90° - x) = sin(x)
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