Trigonometric equations
reverse classroom graphing trig functions with amplitude and period
worksheet as you follow along-up to the 8 minute mark
http://www.chaoticgolf.com/vodcasts/pc/lesson_graphtrig1b/lesson_graphtrig1b.html
angle of inclination
https://www.brightstorm.com/math/trigonometry/advanced-trigonometry/angle-inclination-of-a-line/
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trig identities
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