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3.Trigonometrical Ratios, Functions and Identities
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સમીકરણ $\frac{{\cos 6x + 6\cos 4x + 15\cos 2x + 10}}{{\cos 5x + 5\cos 3x + 10\cos x}}$ ની કિમત મેળવો.
A
$\cos 2x$
B
$2\cos x$
C
${\cos ^2}x$
D
$1 + \cos x$
Solution
(b) The given expression can be written as
$\frac{{(\cos \,6x + \cos \,4x) + 5\,(\cos \,4x + \cos \,2x) + 10\,(\cos \,2x + 1)}}{{\cos \,5x + 5\,\cos \,3x + 10\,\cos x}}$
After solving, we get the required result $i.e.$ $2\,\cos x$.
Standard 11
Mathematics
