find the signs of cos 400°
Answers
Given :- find the sign of cos 400° ?
Solution :-
→ cos 400° = cos (360° + 40°) = cos(360° + A) .
since cos 400° is in first quadrant. we know that, in first quadrant values of all trignometry ratios is +ve .
therefore, value of cos 400° will be positive .
Extra :-
- value of cos is negative in second and third quadrant .
- in 4th quadrant value of cos is positive .
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Given : Cos 400°
To Find : signs of cos 400°
Solution:
As we know that Cos ( n * 360° ± x) = Cosx where n is integer
400 = 1 * 360 + 40
Hence Cos 400° = Cos ( 1 * 360° + 40°)
=> Cos 400° = Cos 40°
Hence lies in 1st Quadrant
and in 1st Quadrant Cos is + ve
Hence signs of cos 400° is + Ve
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