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anonymous
 5 years ago
I have two more to show they are an identity.
sin (A+B)/sin(AB)= cot A + cot B/cot Acot B
and
sin 4x = 4 sin x cos³x4sin³xcosx
anonymous
 5 years ago
I have two more to show they are an identity. sin (A+B)/sin(AB)= cot A + cot B/cot Acot B and sin 4x = 4 sin x cos³x4sin³xcosx

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0for the first one I've gotten as far as changing the left side to read: sinA cosB+cosA sinB/sinA cosBcosA sinB

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0second one: \[sin(4x)=2sin(2x)cos(2x)\] this is the 'double angle' formula for sine thinking of 4x as 2*2x now use the double angle formulas again for sine and cosine and this should give it to you.
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