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Continue to ChatTRIGONOMETRIC RATIOS OF GENERAL ANGLES https://edudelighttutors.com/2020/10/15/the-direction-to-which-angles-are-measured-can-either-be-clockwise-or-anticlockwise-the-plane-is-divided-into-four-partitions-by-the-axes-each-partition-is-called-a-quadrant/