For 0Â°, cosine = 1 and sine = 0; for 30Â°, cosine = â3/2 and sine = 1/2; for 45Â°, cosine = â2/2 and sine = â2/2; for 60Â°, cosine = 1/2 and sine = â3/2; for 90Â°, cosine = 0 and sine = 1.