Question

evaluate: (cos 13+ sin 77)sec 13+(sec 4+cos 76)cos 14

Answer 1

Answer:

4

Step-by-step explanation:

(cos 13+ sin 77)sec 13+(sec 4+cos 76)cos 14

= [cos13 +sin(90-13)]sec13 + [Sec14+Cosec(90-14)]cos 14

= (2cos13)sec13 + (2sec14)cos14

= 2 + 2

= 4.