How do we determine the sign of different trigonometric functions like 3π/2 + x and 3π/2-x and 2π+ x and 2π- x and etc and other functions like this please explain at least for sin and cos of these functions?
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Very easy.. just remember that in first quad
all 6 trigo fn is +ve
in second quad
sin and cosec +ve rest - ve
in third quadrant
tan and cot +ve rest negative
and in 4th quad
cos and sec is +ve rest negative..
hope this will help you
all 6 trigo fn is +ve
in second quad
sin and cosec +ve rest - ve
in third quadrant
tan and cot +ve rest negative
and in 4th quad
cos and sec is +ve rest negative..
hope this will help you
marshmallow9250:
i think you are not getting the quadrant right...
it will be + tanx or + cot x
well remember this
tanx
so whenever there is π/2 so it will change else not
sorry... i didn't get you.. please clear what you want to say
but in the book its given -cot x
???
it should be cotx
actually you can represent tan as cot just by subtracting angle in pi/2. and in third quad tan and cot is always positive
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