Question

if cos(40+X)=sin 30,then x is equal to​

Answer 1

cos(40-x)=sin30

=>cos(40-x)=sin(90-30)

=>cos(40-x)=cos(60 )

cutting cos to cos then

we get,

=>40-x=60

=>-x=40-60

=>-x=-20. (-+-=+)

=>x=2p