tan 13 tan 37 tan 45 tam 53 tan 770.
2 Co sec? 60°Clasa 60°-3.605 60°+2)
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answer is 0.14821
tan13.tan37tan45.tan53.tan770
tan13.tan(90-53).tan45.tan53.tan40
tan13.cot37.tan45.tan53.tan40
tan13.tan40=0.1421
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