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Double angle theorem once:
Double angle theorem twice:
Expand chicken soup and rice:
To get it entirely in terms of sinkx replace cos2x with 1−sin2x (keeping in mind cos4x=(cos2x)2)
Let P(x, y) be the terminal point on the unit circle determined by t. Then sint=,cost=, and tant=.
See answers (1)
See answers (2)
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