There are values of t so that sin t=.3 and cos t=-.6 true or false

Using the identity sin^2(t)+cos^2(t)=1
and 
given sin(t)=0.3,
we can find cos(t) by substituting
sin^2(t)+cos^2(t)=1
0.3^2+cos^2(t) = 1
cos^2(t)=1-0.3^2=1-0.09=0.91
cos(t)=sqrt(0.91)= 0.954  ≠  0.6
So the given proposition is false.

Answer is a not really sure tho