Question: pls help me calculus trigonometric functions differentiation IT. Trigonometric functions : 1. y = Sin (x + 4) Cos (x - 4) , Find y,
pls help me calculus trigonometric functions differentiation

IT. Trigonometric functions : 1. y = Sin (x + 4) Cos (x - 4) , Find y, 2 . Cos ( xy ) = x - y , Find y
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