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How would I set this to 0?

How would I set this to 0?-example-1

1 Answer

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Answer:

− 2 sin ( 0 ) ⋅ sin ( 0 ⋅ π /0 m ) + cos ( 0 ) ⋅ cos ( 0 ⋅ π /0 m ) = 0 is not an identity

Explanation:

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