Sin (Π/2 - theta) = sin(Π/2) * cos(theta) - cos(Π/2) * sin (theta)
and as we know sin(Π/2) =1 , cos(Π/2)=0
so sin(Π/2 - theta) = 1* cos(theta) - 0* sin(theta)= cos(theta)
2nd cos(180+ theta) = cos(180)*cos(theta) - sin(180)* sin(theta)
,,, so , cos(180+theta) = -cos(theta)
<span>Tax rate is 4.5 percent of the item cost
so if you buy shoes that cost 63.20 you have to pay 4.5 percent of this value as tax
so write 4.5 percent as a fraction or decimal
then multiply it by the item cost.
Therefore, </span><span>63.20 x .045 = $2.84</span>
