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[" 1."(cos20^(@)+8sin^(@)0^(@)sin50^(@)sin10^(@))/(sin^(2)80^(@))" is equal to: "],[[" (A) "1," (B) "2," (C) "3/4]]

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

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

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

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

The value of (sin50^(@)+sin10^(@))/(sin70^(@)) is equal to

Value of sin50^(@)-sin70^(@)+sin10^(@) is equal to

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

(cos70^(@))/(sin20^(@))+(cos59^(@))/(sin31^(@))=8sin^(2)30^(@)

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