Math Problems ㅠ 12 2. Simplify cos x cos 5x + sin x sin 5x. 1. Find the exact value of cos (72) 12 sin(x + y) 1+cot rtan

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Math Problems ㅠ 12 2. Simplify cos x cos 5x + sin x sin 5x. 1. Find the exact value of cos (72) 12 sin(x + y) 1+cot rtan y sin x cos y 5. Find the exact value of cos 75° using a half-angle identity. 6. Find the approximate value of each expression rounded to two decimal places. a) sec ¹(-3.187) 7. Find the exact value of each composition without using a calculator. a) tan (arccos (1/2)) b) csc (sin-¹ (3π/4)) 3. Find the exact value of tan 4. Prove that =