Sine is positive in quadrants i and ii only. true or false?

That statement is true

All cos, sin, and tan are positive in quadrant I

only sin and cosec are positive in quadrant II

only tan and cot are positive in quadrant III

and only cos and sec are positive in quadrant IV

hope this helps

The trigonometric function sine is the ratio of the length of the side opposite to the angle to the length of the hypotenuse or the ratio of y and the hypotenuse. For the first and second quadrant, the values of y are all positive and the hypotenuse is always positive. Thus, the statement is TRUE.