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OpenStudy (anonymous):
Evaluate without using a calculator: A.) sin(-390)-tan 495 B.) sin90 cos135 - tan30
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OpenStudy (cwrw238):
A sin (-390) = sin(-390 + 360) = sin(-30) = - sin 30 tan 495 = tan (495 - 360) = tan 135 = -tan45 use the special triangles to find these values
OpenStudy (triciaal):
A. hint -390 + 360 = - 30 and 495 = 360 + 90 + 45
OpenStudy (cwrw238):
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