What is cos(θ-90)?
1 Answer
Jun 17, 2018
Explanation:
#"using the "color(blue)"addition formula for cos"#
#•color(white)(x)cos(x-y)=cosxcosy+sinxsiny#
#cos(theta-90)#
#=costhetacos90+sinthetasin90#
#=costheta(0)+sintheta(1)=sintheta#
