Simplify the expression: cos (7x) cos (4x) + sin (7x) sin (4x).
Its either
co...
Mathematics, 16.04.2020 17:23 eliza35
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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