sin3a/sina+cos3a/cosa=4cos^2a
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Step-by-step explanation:
sin3a/sina+cos3a/cosa
=sin3acosa+cos3asina/sinacosa
=sin(3a+a)/sinacosa
=sin4a/sinacosa
=sin2.2a/sinacosa
=2sin2acos2a/sinacosa
multiplied by 2 in both numerator & denominator
2(2sin2acos2a)/2sinacosa
=2(2sin2acos2a)/sin2a
=2.2cos2a
=4cos2a
thankyou
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