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k0ka [10]
3 years ago
7

Cos(3pi/4)= HELLPPPP

Mathematics
1 answer:
Kitty [74]3 years ago
5 0
3π/4 angle is in the second quadrant, so cos (3π/4) is going to be negative.

Reference angle of 3π/4 is (π - 3π/4) = π/4

cos(π/4) = √2/2

cos (3π/4) = - √2/2

Answer is C.
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