What are the values of sin α and tan α, if:
cosα=0.6

Positive cosine is first or fourth quadrant.  So we don't know the sign of the sine or the tangent.

Everybody's favorite right triangle is 3/4/5 and here we have

So if

then

and

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer