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anonymous
 one year ago
Verify the identity. Show your work.
cos(α  β)  cos(α + β) = 2 sin α sin β
my answer>cos=o
anonymous
 one year ago
Verify the identity. Show your work. cos(α  β)  cos(α + β) = 2 sin α sin β my answer>cos=o

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Teacher:Use the sum and difference formulas for this me:wtf you mean

sohailiftikhar
 one year ago
Best ResponseYou've already chosen the best response.1cos(ab)=cos(a)cos(b)+sin(a)sin(b) cos(a+b)=cos(a)cos(b)sin(a)sin(b) these are the formulas

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0woow ok so do i use both of them or what

sohailiftikhar
 one year ago
Best ResponseYou've already chosen the best response.1you have both terms cos(ab) and cos(a+b) so use both

sohailiftikhar
 one year ago
Best ResponseYou've already chosen the best response.1in this problem

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok so this is a practice question imma gonna be graded on so can you help me plz

anonymous
 one year ago
Best ResponseYou've already chosen the best response.02cos(A)cos(B)=2cos(A)cos(B) ok so i got this instead is this right

sohailiftikhar
 one year ago
Best ResponseYou've already chosen the best response.1no it's not right

sohailiftikhar
 one year ago
Best ResponseYou've already chosen the best response.1ok i'm going to solve it

sohailiftikhar
 one year ago
Best ResponseYou've already chosen the best response.1\[\cos(\alpha\beta)\cos(\alpha+\beta)=(\cos \alpha \cos \beta +\sin \alpha \sin \beta)(\cos \alpha \cos \beta \sin \alpha \sin \beta )\]

sohailiftikhar
 one year ago
Best ResponseYou've already chosen the best response.1now \[\cos \alpha \cos \beta +\sin \alpha \sin \beta \cos \alpha \cos \beta +\sin \alpha \sin \beta =2 \sin \alpha \sin \beta \]
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