" F) "cos50^(@)=......40^(@)

(cot50^(@))/(tan40^(@))

|{:(sin40^@,-cos40^@),(sin50^@,cos50^@):}|=.......

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

Solve (sin40^(@))/(cos50^(@))+(csc40^(@))/(sec50^(@))

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

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

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

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

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