Question

Please solve it.only for maths lover

Answer 1

$\sin^{2} (x) = 3 \div 4$

sin X= ±√3/2

sin X=√3/2 then

X=60° or π/3

sin(60°) =√3/2= cos (30°) =cos(90+30)=sin(120°) =sin (2π/3)

X=2π/3

sin X=-√3/2 => sin (-60) =√3/2

=> X= (-π/3)

so option c is correct X= -π/3 and 2π/3