26 February, 02:47
What is 2cos (ø) + 1=0
26 February, 03:54
the cos inverse of - 0.5 is 120
2cos (ø) + 1=0
2cos (ø) = -1
cos (ø) = -1:2
cos (ø) = -0.5
dividing both sides by cos
cos (ø) : cos (ø) = -0.5:cos
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