pls give the answer.......
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90° - <POS = <ROS (1)
<QOS - <ROQ = <ROS
<QOS - 90° = <ROS (2)
ADD (1) & (2)
<ROS + <ROS = [90 - <POS] + [<QOS - 90]
2<ROS = 90 - <POS + <QOS - 90
2<ROS = <QOS - <POS {90-90=0}
<ROS = 1/2 (<QOS - <POS)
HENCE PROOVED