cot s = -1/3, s in quadrant IV
what is sin s in quadrant IV?
well..
cot s= cos s/sin s
since it's quadrant IV, cos is + and sin is -
-1/3 = 1/-3
sin s= -3
is this correct? i think i'm doing it right.
Hello somanyquestionsYou need to use Pythagoras' Theorem to find the length of the third side:So we can now say:(I've put the minus sign in brackets, because at this stage we don't need to worry about it.)
Now we can look at the sign of sine in QIV (as you correctly did), and say:Grandad