Question

can anyone solve this

Answer 1

81^sin^2x+81^cos^2x=30,,,

[(81^sin^2x)^2+81]/81^sin^2x=30

let,,,81^sin^2x=Y

y^2+81=30y

sinx=1/2

x=30°. and>>>x=60°

Answer 2

81^sin^2x+81^cos^2x=30
let, 81^sin^2x
y^2+81=30y
sinx =1/2
x=30°,x=60°