L=sin(16π+8π)sin(16π−8π)
=sin163π⋅sin(−16π)
=21(cos(163π+16π)−cos(163π−16π))=21(21−cos8π)
M=cos(16π+8π)cos(16π−8π)
=cos163π⋅cos(−16π)
=21(cos(163π+16π)+cos(163π−16π))=21(21+cos8π)
If L=sin2(16π)−sin2(8π) and M=cos2(16π)−sin2(8π)
Held on 5 Sept 2020 · Verified 6 Jul 2026.
L=−221+21cos8π
L=421−41cos8π
M=421+41cos8π
M=221+21cos8π
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