Question: please show steps :) 9. Prove the following identity. Explain your thought process. [T3] [C2] T 10. Solve the following trigonometric equation for 0 S

please show steps :)

9. Prove the following identity. Explain your thought process. [T3] [C2] T 10. Solve the following trigonometric equation for 0 S x $ 2x. Explain your process. [A4] [C2] cos x - 1 = 0

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