Evaluate each of the following Cos 60° cos 45° - sin 60° ∙ sin 45°

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asked Feb 15, 2018 in Mathematics by sforrest072 (157,439 points) 61 411 949
Evaluate each of the following

Cos 60° cos 45° - sin 60° ∙ sin 45°

1 Answer

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answered Feb 15, 2018 by mdsamim (213,225 points) 5 10 15
selected Feb 15, 2018 by sforrest072
 
Best answer

Cos 60° cos 45° - sin 60° ∙ sin 45° …(i)
By trigonometric ratios we know that,

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