[(cos20^(@)+8sin70^(@)sin50^(@)sin10^(@)...

[(cos20^(@)+8sin70^(@)sin50^(@)sin10^(@))/(sin^(2)80^(@))" equal to "],[" A."1" B."2quad C.3/4quad " D.none "]

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(cos20^(@)+8sin10^(@)sin50^(@)sin70^(@))/(sin^(2)80^(@))=

(cos20^(0)+8sin70^(0)sin50^(@)sin10^(0))/(sin^(2)80^(@)) is equal to

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

(cos 20^(@)+8 sin 70^(@) sin 50^(@) sin 10^(@))/( sin^(2)80^(@)) is equal to

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

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

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

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

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

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