The trigonometric function value of that means angle A lies in IV quadrant.

 Using the Pythagorean identity , obtain

Because cos A > 0 in Quadrant IV, you can use the positive root to obtain .

.

The trigonometric function value of that means angle B lies in II quadrant.

Using the Pythagorean identity , obtain

Because sin B > 0 in Quadrant II, you can use the positive root to obtain .

.

                                                                   .

Option H is correct answer.