Question: Example 8: Write as a single trigonometric function: (a) cos(9x) cos(3x) sin(9x) sin(3x) (b) sin(21x)cos(16x) + cos(21x)sin(16x) Example 8: Write as a single trigonometric function:


Example 8: Write as a single trigonometric function: (a) cos(9x) cos(3x) sin(9x) sin(3x) (b) sin(21x)cos(16x) + cos(21x)sin(16x)
Example 8: Write as a single trigonometric function: (a) cos(9x) cos(3x) sin(9x) sin(3x) (b) sin(2 lx) cos(16x) + cos(2 lx) sin(16x)
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