Plane trigonometry, by S.L. Loney.

iv

TRIGONOMETRY.

2.
8.
10.

680 45' 178".
4 - tan4 A.
tan4 inutes.
In 1- minutes.

4 2xy xy
2 +y2 X2_ y2
9. 0= 60~.

4.
6.
8.
10.
12.
14.
16.
19.
22.
25.
28.
31.
34.
36.

X. (Pages 74, 75.)
- 366...; 2-3094.... 5. - 1366...; -2-3094.
0; 2. 7. 1-4142...; -2.
1-366...; -23094.... 9. 45~ and 135~.
120~ and 240~. 11. 135~ and 315~.
150~ and 330~. 13. 150~ and 210~.
210~ and 330~. 15. -cos 25~.
sin 6~. 17. -tan 43~. 18. sin 12~.
sin 17~. 20. - cot 24~. 21. cos 33~.
-cos 28~. 23. cot 25~. 24. cos 30~.
cot 26~. 26. -cosec 23~. 27. cosec 360.
negative. 29. negative. 30. positive.
zero. 32. positive. 33. positive.
positive. 35. negative.
1 - - I - 2
and 13; -3and J3'
7~J33 (ae 8, 84.
XI. (Pages 83, 84.)
nr + (- ) 2..n7-(-l)3

1.

3. nr +(-l1)n.
i '
5. 2n7r - -
4'
37w
8. n7-+.-
11. n^4-(-1)n.

27w
4. 2n7r — I
33
37r 7T
6. 2n7r -.L 7. n7r +.
9 r 7r
9. n7r +-. 10. 2n7r -
4 9 3'

12. nwr t 2 -
2'

13. n7r --
3