Question

tan 56°=
cos 11° + sin 11°\
cos 11° – sin 11°​

Answer 1

Answer:

$tan56 = tan(45 + 11) \\ = \frac{1 +tan11 }{1 - tan11} = \frac{1 + \frac{sin11}{cos11} }{1 - \frac{sin11}{cos11} } \\ = \frac{cos11 + sin11}{cos11 - sin11}$