cos(45^(@)-a)cos(45^(@)-b)-sin(45^(@)-a)sin(45^(@)-b)=sin(a+b)

sin(45^@+A)sin(45^@-A)=

cos 45^(@)-sin 45^(@)=?

Prove that (cos45^(@)-cos75^(@))/(sin45^(@)+sin75^(@))=2-sqrt3

2sin45^(@)cos45^(@)

sin^(2)45^(@)+cos^(2)45^(@)=

Show that sin(45^@+A)cos(45^@-B)+cos(45^@+A)cos(45^@-B)=cos(A-B)

What is the value of |{:(cos 15^(@),sin 15^(@)),(cos 45^(@),sin 45^(@)):}|xx|{:(cos 45^(@),cos 15^(@)),(sin 45^(@),sin 15^(@)):}| ?

sin 45^(@)(cos 45^(@)) =…………..

(sin30^(@))/(cos45^(@))+(cot45^(@))/(sec60^(@))-(sin60^(@))/(tan45^(@))+(cos30^(@))/(sin90^(@))=

Evaluate cos45^(@)cos30^(@)+sin45^(@)sin30^(@) .