2.80*.15=.42
2.80-.42= 2.38
the answer is $2.38 (this was the price before)
Sin2x=2sinxcosx, cos2x=1-2sin^2x
sin(2x)+cos(3x)=2sinxcosx+cos(x+2x)
cos(x+2x)=cosx(1-2sin^2(x))-sinx2sinxcosx
sin(2x)+cos(3x)=2sinxcosx(1-sinx)+cosx(1-2sin^2(x))
15 since its in the middle of 10 and 20
Answer:
I think it would be 3/4. You have to add them in a calculator.
Hope it helps!!!