0
2sin s = cos s; whence,
4sin2 s = cos2 s = 1 - sin2s, and
5sin2 s = 1.
Therefore sin s = ±√0.2 = 0.4472, approx.
Check: cos2 s = 1 - 0.2 = 0.8, whence,
cos s = ±√0.8 = ±2√0.2 = 2 sin s.
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10
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