Need help on how to do it 6-10

5. Simplify 1- sec 0 tan 0 6. Verify: = 2 cot 0 sin - - COS COS - sin tan 0 1 - sec 0 12 12 12 12 Sin 12 sin ( - IT: ) 8. expand: 7. Verify: tan 2 L - x sin x = cosx cos 2x + sin 2x 9. Expand: sin(x + ) 10. cot x + 2cot x + 1 =csc4x