Double & Half Angle Identities (9 Examples)

0:13 Review 19 Trig Identities Pythagorean, Sum & Difference, Double Angle, Half Angle, Power Reducing
6:13 Solve equation sin(2x) equals square root 3 over 2
9:17 Solve equation tan(x/2) equals square root 3 over 3
11:55 Solve equation sin(2x)=cos(x)
15:33 Solve equation cos(2x)+5cos(x)=0
21:06 Evaluate a trig function with a half angle identity
26:19 Evaluate a trig function with a half angle identity
30:01 Proof involving double angles
33:04 Proof involving triple angle
42:01 Evaluate half angle function given a trig ratio in quadrant 3

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