Question

if sinø= 1/2 then cos 2ø=​

Answer 1

Answer:

cos2phai =1-2sin^2phai

cos2phai= 1-2×1/4

cos2phai=1-1/2

cos2phai=1/2

Answer 2

Answer:

$sin0 = \frac{1}{2} \\ using \: formula \\ {sin}^{2}0 + {cos}^{2}0 = 1 \\ { \binom{1}{2} }^{2} + {cos}^{2}0 = 1 \\ \frac{1}{4} + { \cos }^{2} 0 = 1 \\ { \cos }^{2}0 = 1 - \frac{1}{4} \\ { \cos }^{2} 0 = 4- \frac{1}{4} \\ \sqrt { \cos }^{2} 0 = \sqrt \frac{3}{4} \\ {.}^{.}.\cos(0) = \frac{ \sqrt{3} }{2}$