Question

Trigonometry

Answer 1

Answer:

cos (12+10) = cos (22)

Step-by-step explanation:

Cos 12* cos 10* - sin 12* sin 10*

Appling the trig identity: cos (a + b) = cos a.cos b - sin a.sin b

inputing the values of a and b

cos (12 + 10) = cos 12cos 10 - sin 12sin 10  = cos (22)