state gov AP Police SI (Pre+Mains) Mock Test 2022 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
\(\frac{{cos6x\; + \;6cos4x\; + \;15cos2x\; + \;10}}{{cos5x\; + \;5cos3x\; + \;10\cos x}} = ?\)
1
cos2x
2
sinx + cosx
3
2cosx
4
2sin2x