if sin 12 show that 3cos-4cos3


If sin? =  1/2 , show that 3cos?-4cos3? = 0.

Ans:    Sin ? = ½

⇒ ? = 30o

Substituting in place of ? =30o. We get 0.

 

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Mathematics: if sin 12 show that 3cos-4cos3
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