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Find the value of the following: (cos7...

Find the value of the following:
`(cos70^(@))/(sin20^(@))+(cos59^(@))/(sin31^(@))+(costheta)/(sin(90^(@)-theta))-8cos^(2)60^(@)`

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cos 60^(@) sin 30^(@) +cos 30^(@) sin 60^(@)=

cos30^(@)sin60^(@)+cos60^(@)sin30^(@)= ……………………

co60^(@)sin30^(@)+cos30^(@)sin60^(@) =___.