Prove that cos3a-cosa/sin3a-sina+cos2a-cos4a/sin4a-sin2a=Sina/cos2acos3a
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cos3a - cosa / sin3a – sina + cos2a - cos4a / sin4a - sin2a = Sina / cos2a cos3a is simple to prove that they are equal.
It is sensible trick to get thing in terms of sinA and cosA.
2 aspects and notice the way it is going and use the product formulation to split cos3A etc in terms of cosA and sinA them respectively in equal.
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