Question 579900
Sin x = 3/4

sin x = opposite side / hypotenuse=3/4

opposite side = 3
hypotenuse = 4

so adjacent side = sqrt(4^2-3^2) by hypotenuse theorem

{{{sqrt(16-9)}}}

={{{sqrt(7)}}}

Cos x = adjacent side / hypotenuse

Cos x = {{{sqrt(7)/4}}}