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misal cosy = x
√2x = 2x²
2x² = √2 * x
2x = √2 * x / x
2x = √2
x = √2 / 2
x = 1/2√2
nilai cos yang memenuhi 1/2√2 :
(45°, 315°)
Dengan selesaian:
cos y = 0
y = {90°,270°}
Dan.
2cos y - √2 = 0
2cos y = √2
cos y = 1/2 √2
Didapat:
y = {45°,315°}
Sehingga,
HP = {y | 45°,90°,270°,315°}