5. arcsm 0. arcsmU 1 7. arccos 8. arccos 0 9. arctan 3 10. arctan 1 11. arcsin 3 13. tan-(- /3) 12. arctan /3 14. cos-'(-2) 15. arccos 16. arcsin 2 V3 /3' 17. sin 18. tan 2 3

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