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Ask community Community Discussion Question: sin 72 - sin 60 =?
Reply Forum Index -> Trignometry originally posted here on IIT-JEE / AIEEE community   
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[Post New] 22 Jun 2011 19:48:22 IST
   Subject: sin 72 - sin 60 =?
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sanidhya saraswat (0)

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sin 72 - sin 60 =?
    

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[Post New] 23 Jun 2011 03:40:28 IST
   Subject: sin 72 - sin 60 =?
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Juhi Sharma (1527)

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we know that sin(90-A) =cos A

therefore sin 72 = cos 18

we know that cos 18=

and sin60 =

therefore rquired value =    - 

solve it and get the answer
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