Value of cos65°cos12°+sin65° sin12°

-The Answer must be in either sin or cos and must be followed with a degree (i.e. cos88°)

1.6

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- Feb 3rd 2010, 10:41 PMcerosevenAnother trig question
Value of cos65°cos12°+sin65° sin12°

-The Answer must be in either sin or cos and must be followed with a degree (i.e. cos88°)

1.6 - Feb 3rd 2010, 11:00 PMVonNemo19
You want the seccend sum or difference identity, here

Table of Trigonometric Identities - Feb 3rd 2010, 11:15 PMceroseven
How would this be substituted in the equation?

- Feb 4th 2010, 08:31 PMVonNemo19