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bmmoffattb
 one year ago
Show that this is an identity by using the definitions of the sum and difference formulas for cosine:
sin(a)sin(b)=1/2[cos(ab)cos(a+b)]
And complete these steps:
Reason
Apply the definitions of the sum and difference identities for cosine
Simplify the expressions
bmmoffattb
 one year ago
Show that this is an identity by using the definitions of the sum and difference formulas for cosine: sin(a)sin(b)=1/2[cos(ab)cos(a+b)] And complete these steps: Reason Apply the definitions of the sum and difference identities for cosine Simplify the expressions

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0½(cos (a  b)  cos (a + b)) = ½(cos a cos b + sin a sin b  (cos a cos b  sin a sin b)) = ½ (cos a cos b + sin a sin b  cos a cos b + sin a sin b) = ½(2 sin a sin b) = sin a sin b

bmmoffattb
 one year ago
Best ResponseYou've already chosen the best response.0How about sin((pi/2)x)?
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