finish 10.4 / 10.5 ws - "The Unit Circle - AGAIN" (#1 is sin 90)
reference angle: distance from 0, 180 or 360 (the x-axis). if the reference angle is the same, then the value will also be the same, but the sign (+/-) can change. think about what is positive in which quadrants. use the GSTK sheet!
if the angle is 0, 90, 180, 270 or 360 you do not need a reference angle - just state the value of x (cos) or y (sin) or y/x (tan). you should always get 0, +/-1, or UD*
reference angle: distance from 0, 180 or 360 (the x-axis). if the reference angle is the same, then the value will also be the same, but the sign (+/-) can change. think about what is positive in which quadrants. use the GSTK sheet!
if the angle is 0, 90, 180, 270 or 360 you do not need a reference angle - just state the value of x (cos) or y (sin) or y/x (tan). you should always get 0, +/-1, or UD*
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