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Trignometry

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7 May 2012 10:44:37 IST

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256

value of expression

Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Trigonometry

if the value of expression cos2π/15*cos4π/15*cos6π/15*cos14π/15 is x then the value of 1/√x is?

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Sagar Saxena

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Posts: 8064

6 Jul 2012 20:02:05 IST

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Divide and multiply by 4 .

Now consider 1 and last

and 2 and 3rd

Now reduce in term of cosa+cosb

And the value would be 16

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