Question

Kąt ∂ jest ostry i cos∂=¾ .oblicz sin∂

Answer 1

sin∂^2 + cos∂^2 = 1
sin∂^2 + (¾)^2 = 1
sin∂^2 + 9/16 = 1
sin∂^2 = 1 - 9/16
sin∂^2 = 16/16 - 9/16
sin∂^2 = 7/16
sin∂ = √7/√16
sin∂ =  √7/4