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Mathematics, 07.04.2021 01:20 willcoop6470

Simplify the expression: cos (7x) cos (4x) + sin (7x) sin (4x). Its either

cos(11x)

cos(3x)

sin(11x)

sin(3x)

The ANSWER IS COS(3X)

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You know the right answer?
Simplify the expression: cos (7x) cos (4x) + sin (7x) sin (4x). Its either

cos(11x)
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