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:
Havana was born on February 14, 1987. How old was she on her birthday in 2002?
2 answers:
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