Finding Quadrant and Sign of a Trigonometric Function
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Find the quadrant of the angle, sign, reference angle and value of the trigonometric functions below:
1. sin 642°
2. csc ( -8.785)
3. sec ( 23pi / 5 )
4. tan ( -7.228)
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(1) 642 degrees = IV quadrant, sin 642 deg is negative, the reference angle = 78 deg and sin 642 deg = -0.9781
(2) -8.785 ...
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