Question

Guys i really need help. i am new to these type of math problems Please help me

Answer 1

7.
I: when no unit, assume radians

II: hmm, 0 to pi/2 radians is 1st quadrant, pi/2 to pi is 2nd, pi to 3pi/2 is 3rd and 3pi/2 to 2pi is 4th
pi/2<1.57<pi so it is in 2st quadrant

III:
cos is negative here because cos is the x axis

IV. no because the value of cos(1.75rad) should be negative




8.
I: from 0 to 90 is 1st
from 90 to 180 is 2nd
from 180 to 270 is 3rd
from 270 to 360 is 4th

so it is in 2nd quadrant


II: sin is positive here because sin is the y axis

III: sin should be positive here so a negative value is not reasonable

IV: maybe she put 125 without putting the degrees and the calculator thought that it was radians