Find the area of the area of the triangle whose sides have the given lengths: a = 9, b = 12, c = 15. Exercise 6: Express -√3 sin x + cos x in the form k sin(x+p). Exercise 7: Write the sum sin(5x) + sin(3x) as a product. Exercise 8: Verify the identity sin z+sin y cos z+cos y z+y = tan ty

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