| __ | 1. | 1/cos2 x | | A. | 1/tanx | | __ | 2. | 1/tan2 x | | B. | senx/cosx | | __ | 3. | cosx/senx | | C. | 1/cosx | | __ | 4. | cotx | | D. | 1/senx | | __ | 5. | cscx | | E. | 1-cos2 x | | __ | 6. | secx | | F. | sen x cos y+ cos x sen y | | __ | 7. | sen(x+y) | | G. | cotx | | __ | 8. | sen2 x | | H. | sec2 x | | __ | 9. | sen x/2 | | I. | ±((1-cosx) /2)0.5 | | __ | 10. | tanx | | J. | cot2 x |
| __ | 11. | cos(x+y)cos(x-y) | | A. | -21/221 | | __ | 12. | cos(x-y) | | B. | cos 60 | | __ | 13. | cos 2x | | C. | cos2x cos2y - sen2x sen2 y | | __ | 14. | cos 2x | | D. | sen 45 | | __ | 15. | cos 45 | | E. | 140/171 | | __ | 16. | cosec2 x | | F. | cos2 x- sen2 x | | __ | 17. | sen 30 | | G. | 1+ cotg2 x | | __ | 18. | senx cosy | | H. | cos2 x - sen2 x | | __ | 19. | tan (x+y) | | I. | (2tanx)/(1-tan2 x) | | __ | 20. | tan 2x | | J. | 1/2{sen(x+y)+sen(x-y)} |
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