solution (Question: 364632.0 )

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ravindra

· started a discussion

· 1 Months ago

solution (Question: 364632.0 )

cos15 cos(15/2) cos(165/2)
=1/2(cos15) 2.cos(15/2) cos(165/2)
=1/2(cos15) (cos90+cos75) [2cosx.cosy=cos(x+y)+cos(x-y)]
=1/2(cos15 sin15) [cos90=0 and cos75=sin15]
=1/4(2cos15 sin15)
=1/4(sin30) [2sinxcosx=sin2x]
=1/8

Question:

Find the value of cos 15°. cos $7 {\frac{1}{2}}^{o}$ .cos $82 {\frac{1}{2}}^{o}$ .

Options:

$\frac{1}{2}$

$\frac{1}{8}$

$\frac{1}{4}$

$\frac{1}{16}$

Solution:

Ans:(b)

Shivashish Shukla

· commented

· 1 Months ago

Yet to be approved!

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solution (Question: 364632.0 )

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