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anonymous
 one year ago
Which sum or difference identity would you use to verify that sin (90° + (theta) = cos (Theta)?
a.
cos (a b) = cos a cos b + sin a sin b
b.
sin (a +b) = sin a cos b + cos a sin b
c.
sin (a b) = sin a cos b cos a sin b
d.
cos (a +b) = cos a cos b  sin a sin b
anonymous
 one year ago
Which sum or difference identity would you use to verify that sin (90° + (theta) = cos (Theta)? a. cos (a b) = cos a cos b + sin a sin b b. sin (a +b) = sin a cos b + cos a sin b c. sin (a b) = sin a cos b cos a sin b d. cos (a +b) = cos a cos b  sin a sin b

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alekos
 one year ago
Best ResponseYou've already chosen the best response.0Well. I reckon it would have to be either b or c. What do you think?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It looks to be that they are asking for the sum of identities. I think, not entirely sure, but I think... So this brings me to believe it, B.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Krishtika Well, looking at the equation I see this. (90° + (theta)) which makes me think a+b and, I know that it is not d.

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1\[\Large\rm \sin(90^o+\theta)=\sin90^o \cos \theta+ \cos 90^o \sin \theta\] \[\Large\rm =(1) \cos \theta+ (0) \sin \theta\] Mmm ya it looks using the `sum` formula gives us the correct result, ya? :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@zepdrix So, Am I correct with it being B?
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