EXERCISES 4 (a)state which of the following are positive and how?(i) cos 271(ii) sec 73°(iv) cosec 159°sec 199°(vi) cos 315º (viii) Co 375°(ii) sin 302(vi) cosec 126LC.trigonometric ralios of some acute⁸
Answers
Given : (i) cos 271(ii) sec 73°(iv) cosec 159°sec 199°(vi) cos 315º (viii) Co 375°(ii) sin 302(vi) cosec 126
To Find : state which of the following are positive
Solution:
Sin/Cosec 0° to 180° + ve 180° to 360° - ve
Cos/Sec 0° to 90° and 270° to 360° + ve and 90° to 270° - ve
cos 271° between 270° and 360° hence +ve
sec 73° between 0° and 90° hence +ve
cosec 159° between 0° to 180° hence +ve
sec 199° between 90° to 270° hence -ve
cos 315º between 270° to 360° hence +ve
Cos 375° = Cos 15° between 0° to 90° hence +ve
sin 302° between 180° to 360° hence -ve
cosec 126° between 0° to 180° hence +ve
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