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)

Answers: 1

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Do you know the correct answer?

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

cos(11x)