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anonymous
 5 years ago
I REAAAAAALLLLLLY NEED HELP! :'(
express cos80ºcos70º+sin80ºsin70º as a single trigonometric function of a positive acute angle.
anonymous
 5 years ago
I REAAAAAALLLLLLY NEED HELP! :'( express cos80ºcos70º+sin80ºsin70º as a single trigonometric function of a positive acute angle.

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0well the answer is;0.86255518

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0how did you get that?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you need to use the double angle formula for cosine: \[\cos(\theta\phi)=\cos(\theta)\cos(\phi)\sin(\theta)\sin(\phi)\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You have \[\theta = 80, \phi = 70\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Correction  the sign on the righthand side should be +, not .

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Not really  he asked for an explanation.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but cool cause my friend needed the formula thanks
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