Asked by Anonymous
Evaluate and simplify cos(-15º). Hint: Substitute 30º-45º for -15º.
Answers
Answered by
Reiny
Well, why not follow that hint
sin(-15) = sin(30 - 45)
= sin30cos45 - cos30sin45
= ....
You should know the trig functions of those special angles.
sin(-15) = sin(30 - 45)
= sin30cos45 - cos30sin45
= ....
You should know the trig functions of those special angles.
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