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if A and B are acute angles satisfying sinA=sinB*sinB and 2cosAcosA=3cosBcosB then A+B=
if sinX*cosY=1/4and 3tanX=4tanY then sin(X-Y)=
if tan40+2tan10=cotA then A=
if 2tanA+cotA=tanB then cotA+2tan(A-B)=
if A+B+C=180, prove that, asin(B-C)+bsin(C-A)+csin(A-B)=0.
prove cosx-sinx/cosx+sinx = sec2x-tan2x
A tree x m high the angle of elevation of its top from a point P on the ground is 23. from another point Q, 10 m from P and in line with P and the foot of the tree, the angle of elevation is 32. Find x.
In a cyclic quadrilateral ABCD PROve that sin(a/2) =cos(b/2)
Find the exact value by using a half-angle identity.

cosine of five pi divided by twelve.
Write the expression as either the sine, cosine, or tangent of a single angle.

cosine of pi divided by three times cosine of pi divided by five plus sine of pi divided by three times sine of pi divided by five.
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