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" 13."sin50^(@)+cos40^(@)=2cos...

" 13."sin50^(@)+cos40^(@)=2cos

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Evaluate : sin50^(@)cos40^(@)+cos40^(@)+cos50^(@)sin40^(@)

Evaluate : sin50^(@)cos40^(@)+cos40^(@)+cos50^(@)sin40^(@)

Without using trigonometric tables,find the value of ((sin50^(@))/(cos40^(@)))+((cos ec40^(@))/(sec50^(@)))-4cos50^(@)cos ec40^(@)

Find the value of (sin 50^(@))/(cos40^(@))+("cosec"40^(@))/(sec 50^(@))-4cos 50^(@) " cosec"40^(@).

Evaluate: sec 50^(@) sin 40^(@)+cos 40^(@) cosec 50^(@) .

Prove that (sin70^(@)-cos40^(@))/(cos50^(@)-sin20^(@)) = 1/(sqrt(3)) .

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@)) =

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@))=

(sin 70^(@) + cos 40^(@))/(cos 70^(@) + sin 40^(@))=

Find the value of sin50^(@)-cos40^(@) .