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16 votes
16 votes
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)

User Nishith Kumar
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1 Answer

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24 votes

Answer:

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Explanation:

User Topera
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