cos a = √1-sin²a = √1-64/289 = = √225/289 = 15/17
tg a = sin a/cos a = 8/17 • 17/15 = 8/15
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cos a = √1-sin²a = √1-64/289 = = √225/289 = 15/17
tg a = sin a/cos a = 8/17 • 17/15 = 8/15