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# Ks5 trigonometry

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### Ks5 trigonometry

1. 1. Trigonometry
2. 2. What is sin90?
3. 3. cos0=?
4. 4. cosx repeats every?
5. 5. tanx repeats every?
6. 6. sin30=cos30 True or False
7. 7. Solve sinx=cosx for x≤180
8. 8. sin50=sin310 <ul><li>True or false </li></ul>
9. 9. cos70=cos110 <ul><li>True or False? </li></ul>
10. 10. tan45=tan225 <ul><li>True or False </li></ul>
11. 11. sin²x+cos²x=?
12. 12. If sin²x+cos²x=1 Which of these are wrong? <ul><li>A 1+cot²x=cosec²x </li></ul><ul><li>B tan²x+1=sec²x </li></ul><ul><li>C sec²x-1=tan²x </li></ul><ul><li>D cosec²x+1=cot²x </li></ul>
13. 13. Sin(A+B)= <ul><li>A sinAsinB-cosAcosB </li></ul><ul><li>B sinAcosB-cosAsinB </li></ul><ul><li>C cosAsinB+cosBsinA </li></ul><ul><li>D sinAcosA+sinBcosB </li></ul>
14. 14. Which of these are correct cos2A= <ul><li>A sin²A-cos²A </li></ul><ul><li>B 2sin²A-1 </li></ul><ul><li>C cos(A+A) </li></ul><ul><li>D 1-2cos²A </li></ul>