C2 Trigonometric Identities. cos ²ø + sin ²ø = 1 So cos ²ø = 1 - sin ²ø And sin ²ø = 1 - cos ²ø. sin ø = tan ø cos ø. 1. Use this information to solve 2 cos ²ø – sinø – 1 = 0 for 0 ≤ ø ≤ 360. 2. Solve tan ø =4cosø for -180 ≤ ø ≤ 180.

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