sin 18×cos 72 + cos18×sin 72 ಯ ಬೆಲೆಯನ್ನು ಕಂಡುಹಿಡಿಯಿರಿ.
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→Sin18.Cos72+Cos18.Sin72
Using [SinA.CosB+CosA.SinB=Sin(A+B) ]
→Sin(18+72)
→Sin90=1
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