15. dando todas las soluciones, resuelva la ecuación: 2sen20 – seno – 1 = 0
a. 0 = -0.52 + 2k1, 0 = =+ 2kr
c. 0 = 0.52 + 2k1, 0 = - + 2knt
b. 0 = -0.52 + 2km, 0 = - + 2km
d. 0 = -0.52,

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.