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anonymous
 5 years ago
cos. of 23 degrees?
anonymous
 5 years ago
cos. of 23 degrees?

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0cos(ab) = cosa cosb + sina sinb cos(a+b) = cosa cosb  sina sinb cos23 = cos(6037) cos(6037) = cos60 cos37 + sin60 sin37 = (1/2)(4/5) + (sqrt of 3 /2) (3/5)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[(4/10) + (3\sqrt{3}) /10 = (1/10) (4+3\sqrt{3})\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0english please? lol ur dealing with a blonde here

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0that's the formula you can get \[\cos 23^{o} \] from \[\cos(60^{o}37^{o})\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0cos(ab) = cosa cosb + sina sinb so for cos23 > cos(6037) = cos60 cos37 + sin60 sin37 we know that cos60 is 1/2 cos 37 is 4/5 sin 60 is \[\sqrt{3}/2\] and sin 37 is 3/5 then just plug the values of those sin and cosine to the formula
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