Juanita works at a telemarketing company. She makes 12 sales calls per hour. Employees are encouraged to make more than 480 call
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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: