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# Please help?

Advanced function gr12

### 1 Answer

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- hayharbrLv 71 month ago
cos²Θ = 1 - sin² Θ so make that substitution then simplify.

3(1 - sin² Θ) - 5 sin Θ - 4 = 0

3 - 3 sin² Θ - 5 sin Θ - 4 = 0

0 = 3 sin² Θ + 5 sin Θ + 1

Quadratic formula

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