zhèng xián
sine (of angle), written sin θ
zhèng xián bō
sine wave
simple harmonic vibration
shuāng qū zhèng xián
hyperbolic sine or sinh (math)
zhèng xián xíng
sinusoidal (shaped like a sine wave)
shuāng qū xiàn zhèng xián
hyperbolic sine or sinh (math)