Find the Value cos `54^@` or sin `36^@`

Find the Value of cos36^(@) or sin54^(@)

Find the value of cos 15^(@) using the relation cos (A - B) = cos A cos B + sin A sin B .

Find the value of (cos pi+i sin pi)

Find the Values of (sin36^(@))/(cos54^(@))*

Find the value of cot54^@/(tan36^@)+tan20^@/(cot70^@)

Find the value of cos 12^@*cos 24^@*cos 36^@*cos 48^@*cos 72^@*cos96^@

If sin (A-B)=sin A cos B-cos A sin B and cos (A - B) = cos A cos B + sin A sin B . find the values of sin 15^@ and cos 15^@.

What is the value of sin 18^@ cos 36^@ ?