12. Prove each identity. State any restrictions on the variables. cos 0 + cos 0 T...

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12. Prove each identity. State any restrictions on the variables. cos 0 + cos 0 T sin 0 + 2 cos 0 - 1 a) sin 0 + 3 cos 0 - 3 sin 0 2 sin a b) sin a cos a - - tan = a - 2 sin a - - 1 2 1 sin a - 12. Prove each identity. State any restrictions on the variables. cos 0 + cos 0 T sin 0 + 2 cos 0 - 1 a) sin 0 + 3 cos 0 - 3 sin 0 2 sin a b) sin a cos a - - tan = a - 2 sin a - - 1 2 1 sin a -