Find the value of sin 50ocos 40o+cosec 40osec 50o−4 cos 50o cosec 40o.
As we know
sin50o=sin(90−40)=cos50o
cosec40o=cosec(90−50)=sec40o
cos50o=cos(90−40)=sin40o
sin40o cosec40o=1
now put these values in this,
sin 50ocos 40o+cosec 40osec 50o−4 cos 50o cosec 40o
and we get,