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mitchelsewbaran
 3 years ago
Find an exact value.
cos 15°
mitchelsewbaran
 3 years ago
Find an exact value. cos 15°

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RadEn
 3 years ago
Best ResponseYou've already chosen the best response.0then use the formula : cos(AB) = cosAcosB + sinAsinB

RadEn
 3 years ago
Best ResponseYou've already chosen the best response.0here given A=45 and B=30 degrees

mitchelsewbaran
 3 years ago
Best ResponseYou've already chosen the best response.0cos 45cos30 +sin45cos30?

RadEn
 3 years ago
Best ResponseYou've already chosen the best response.045 and 30 are the special angles.. u have to remember the values of sin and cos for angles 30 and 45 degrees

mitchelsewbaran
 3 years ago
Best ResponseYou've already chosen the best response.0ok. how do i solve from here?

RadEn
 3 years ago
Best ResponseYou've already chosen the best response.0u just put the values of them (sin45, sin 30, cos45, cos 30)

RadEn
 3 years ago
Best ResponseYou've already chosen the best response.0cos 45cos30 +sin45cos30 = ... (calculate it and simply)

RadEn
 3 years ago
Best ResponseYou've already chosen the best response.0hmm.. what identity did u use ? it should be : cos 45cos30 +sin45cos30 do u know the exactly value of sin30 ? sin45 ? cos30 ? cos45 ?

miley28
 3 years ago
Best ResponseYou've already chosen the best response.0just put the values cos45 =1/root 2 and cos 30= root3/2

miley28
 3 years ago
Best ResponseYou've already chosen the best response.0sin 45=1/root ovr2 and sin 30=1/2...the multiply and add

mitchelsewbaran
 3 years ago
Best ResponseYou've already chosen the best response.01/root ovr2 or 1/ root 2?
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