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Reduce the following to the sine or cosine of one angle: (i) sin145*cos75  cos145*sin75 (ii) cos35*cos15  sin35*sin15 Use the formulae: sin(a+b)= sin(a) cos(b) + cos(a)sin(b) and cos(a+b)= cos(a)cos(b)  sin(a)sin)(b) (1)The quantity … 
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Sin(Xy)sin(x+y)=sin^2 x  sin^2 y work on one side only...so i worked on the right =(sinxsiny)(sinx+siny) does that equal sin(xy)sin(x+y)? 
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Sin(Xy)sin(x+y)=sin^2 x  sin^2 y work on one side only...so i worked on the right =(sinxsiny)(sinx+siny) does that equal sin(xy)sin(x+y)? 
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Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6 x=1  (3/4)sin^2 2x work on one side only! Responses Trig please help!  Reiny, Monday, February 23, 2009 at 4:27pm LS looks like the sum of cubes sin^6 x + cos^6 … 
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The expression 4 sin x cos x is equivalent to which of the following? 
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I can't seem to prove these trig identities and would really appreciate help: 1. cosx + 1/sin^3x = cscx/1  cosx I changed the 1: cosx/sin^3x + sin^3x/sin^3x = cscx/1cosx Simplified: cosx + sin^3x/sin^3x = cscx/1cosx I don't know …