How to determine sign of sine and cos in all 4 quadrants?
Answers
in 1st quadrant all the trigonometric ratios are positive
in 2nd quadrant sin and cosec are positive remaining are negative
in 3rd quadrant tan and cot are positive remaining are negative
in 4 the quadrant cos and sec are positive remaining are negative...
this can be easily remembered by a simple short cut all silver tea cups...
hope it helps you
1) IN 1st QUADRANT :-
all the trigonometric ratios are positive.
sin : +ve cosec : +ve
cos : +ve sec : +ve
tan : +ve cot : +ve
2) IN 2nd QUADRANT :-
only sin and cosec are positive.
sin : +ve cosec : +ve
cos : -ve sec : -ve
tan : -ve cot : -ve
3) IN 3rd QUADRANT :-
only tan and cot are positive .
sin : -ve cosec : -ve
cos : -ve sec : -ve
tan : +ve cot : +ve
4) IN 4th QUADRANT :-
only cos and sec are positive .
sin : -ve cosec : -ve
cos : +ve sec : +ve
tan : -ve cot : -ve