prove that cos 3π/4=-1/√2
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Answered by
0
Answer:
hi...
3π\4=135° ok it lies in second quadrant
in second quadrant cos is negative spit has negative sign
w.k.t
cosπ\4=1/√2
so cos3π/4=cos3(π\4)
=_(1/√2)
Answered by
0
Answer:
formula ,
cos(π- ∅) = -cos∅
see the attachment for the solution.
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