`sin12 0^@ cos15 0^@-cos24 0^@sin33 0^@`

Show that sin 70^0 cos 10^0 - cos 70^0 sin 10^0 = sqrt(3)/2

Evaluate the equation ;- cos 90^(@) sin 0^(@) - sin 0^(@) cos 90^(@) .

Prove that: sin600^0cos 390^0+cos 480^0sin 150^0=-1

Prove the following: sin18^@cos39^@+sin6^@cos15^@=sin24^@cos33^@

sin 15^(@) + cos 105 ^(@) = ............ A) 0 B) 2 sin 15 ^(@) C) cos 15^(@) + sin 15^(@) D) sin 15^(@) - cos 15^(@)

Evaluate the following: sin 78^0cos 18^0-cos 78^0sin 18^0

Prove that sin(-420^0)cos(390^0)+cos(-660^0)(sin330^0)=-1

Evaluate the following: cos 80^0cos 20^0+ sin 80^0 sin 20^0

Prove that: sin(-420^0)(cos390^0)+cos(-660^0)(sin330^0)=-1.