Show that 3cos-4cos3 = 0, Mathematics

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

Ans:    Sin ? = ½

⇒ ? = 30o

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

 

Posted Date: 4/9/2013 1:05:42 AM | Location : United States







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