What is the value of `(cos15^(@)+cos45^(@))/(cos^(3)15^(@)+cos^(3)45^(@))`

What is the value of cos 15^(@) ?

What is the value of cos15^(@)-cos165^(@) ?

What is the value of 2sin15^(@) cos 15^(@)-4sin^(3)15^(@)cos15^(@) ?

Find the value of (sin45^(@) + cos 45^(@))

Find the valueof 2cos45^(@).cos15^(@) :

The value of cos15^(@)-sin15^(@) is

Find the value of cos 45^(@) + sin 45^(@)

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