Trigonometry
Angle Sum and Difference, Double Angle and Half Angle Formulas
Find the exact value of:
Cos 12* cos 10* - sin 12* sin 10*

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)

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if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.