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Asked by spencer

using the trigonometric identities find the exact (radical form) value of cos (105 degrees)
15 years ago

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Answered by Reiny
cos 105°
= cos(60+45)
= cos60cos45 - sin60sin45
= (1/2)(√2/2) - (√3/2)(√2/2)
= (√2 - √6)/4
15 years ago
Answered by vian
cos195
13 years ago
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using the trigonometric identities find the exact (radical form) value of cos (105 degrees)

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