Question 1156807
tan A >0 in the first and third quadrants (it is sin/cos)
sin A >0 in the first and third quadrants
the product is positive and is in the first quadrant.  

In the third quadrant tan A is positive because  sin A is - and cos A is -. Their quotient is positive,but if multiplied by the - sin A in the third quadrant, that product would be negative.