[" 28.Five that "],[sin10^(@)sin50^(@)+sin50^(@)sin250^(@)+sin29^(@)+sin6^(@)=-(3)/(4)]

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sin10^(@)sin50^(@)+sin50^(@)sin250^(@)+sin250^(@)sin10^(@)=-(3)/(4)

sin10^(@)sin30^(@)sin50^(@)sin70^(@)sin90^(@)=

(i) sin10^(@)sin50^(@)sin70^(@)

sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)-sin70^(@)-sin80^(@)=

sin50^(@)-sin70^(@)+sin10^(@)=?

sin10^(@)+sin20^(@)+sin40^(@)+sin50^(@)=sin70^(@)+sin80^(@)

value of sin10^(@)sin30^(@)sin50^(@)sin70^(@)

sin 10^(@) sin 30^(@) sin 50^(@) sin 70^(@) sin 90^(@)=

Prove that, sin10^(@)+sin50^(@)-sin70^(@)=0