h = 8 sin [π/10(t-5) ] + 9
covert to cosine??
cos(pi/2 - x) = sin(x)
so,
cos(π/2 - π/10(t-5)) = sin(π/10(t-5))
you should probably simplify that.
covert to cosine??
so,
cos(π/2 - π/10(t-5)) = sin(π/10(t-5))
you should probably simplify that.