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8. (T 3 Marks) Prove the trigonometric identity. sin xtanx+ sinx tanx 1 COS X 9. (T2 Marks) A sinusoidal function has amplitude of

8. (T 3 Marks) Prove the trigonometric identity. sin xtanx+ sinx tanx 1 COS X 9. (T2 Marks) A sinusoidal function has amplitude of 6 units, a period of 18, and a minimum at (0, 3). Determine an equation of the function.

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