23. sin 10° sin 30° sin 50° sin 70°
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Step-by-step explanation:
=sin10 sin30 sin50 sin70
=cos[90-10] sin30 cos[90-50] cos[90-70]
=cos80 1/2 cos40 cos20
=1/4cos20 cos80 cos40 2sin20cos20
=1/8sin20 cos80 2cos40cos40
=1/16sin20 2cos80
=1/16cos20 sin160
=1/16sin20 sin[180-20]
=1/16sin20 sin20
=1/16
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