If 0<theta<360, find all values of theta, cos theta = -1 ?

Question

If it's a minus we use the negative quadrant but do we add a negative infront of the answer?

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Answer 1 · 2018-07-16T13:10:30

#color(magenta)(theta = pi^c#

Given : #cos theta = -1#

#cos (0^@) = 1#

#cos (180^@) = -1#

#cos (360^@) = cos (0^@) = 1#

#:. color(magenta)(theta = 180^@# or #color(magenta)(theta = pi^c#