Sin(30) + cosec(30) = sin(30) + 1/sin(30) = 0.5 + 1/0.5 = 0.5 + 2 = 2.5
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A sine wave has no harmonics. It only has a fundamental, so the value of the 2nd, 3rd, and 12th harmonics of a sine wave is zero.
Relief holes are provided for easy handling of sine bar and for reducing the weight of the sine bar.
It's called a sine wave because the waveform can be reproduced as a graph of the sine or cosine functions sin(x) or cos (x).
See related links for information about sine charts.
The fourier series of a sine wave is 100% fundamental, 0% any harmonics.