The quotient of two numbers is negative. It must be true that _____. a neither number is negative b one of the numbers is negati
2 answers:
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We will use the sine and cosine of the sum of two angles, the sine and consine of 
, and the relation of the tangent with the sine and cosine:
If you use those identities, for
, you get:
Hence:
If you use those identities, for
Hence: