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Original Question
How do you express in terms of angles less than 90 degrees? sin 120 degrees cos 150 degrees tan 280 degreesAsked by Wes
How do you express in terms of angles less than 90 degrees?
sin 120 degrees
cos 150 degrees
tan 280 degrees
sin 120 degrees
cos 150 degrees
tan 280 degrees
Answers
Answered by
Reiny
Always ask yourself,
1. What quadrant is the angle in? That determines the ± according to the CAST rul
2. "How far is it to the x-axis"?
sin 120° = sin60
cos150° = -cos 30
tan 280° = -tan 80°
1. What quadrant is the angle in? That determines the ± according to the CAST rul
2. "How far is it to the x-axis"?
sin 120° = sin60
cos150° = -cos 30
tan 280° = -tan 80°
Answered by
victor_hery
Sin (180 - A) = sin A. (angle in degrees)
sin 120 = sin (180 - 60) = sin 60
Cos (180 - A) = - cos A
cos 150 = cos (180 - 30) = - cos 30
tan (360 - A) = - tan A,
tan 280 = tan (360 - 80) = - tan 80
sin 120 = sin (180 - 60) = sin 60
Cos (180 - A) = - cos A
cos 150 = cos (180 - 30) = - cos 30
tan (360 - A) = - tan A,
tan 280 = tan (360 - 80) = - tan 80
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