The angle y whose cosine is -1 is π
From the information, the angle y whose cosine is−1 and which is in the interval [0, π] can be written as:
Determine the value of y
cos y = -1
Take the sin invers of both sides
arccos y = arccos(-1)
y = arccos (-1)
y = 180 degrees = π
Hence the angle y whose cosine is -1 is π
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