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answer may help you boy
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Saharshthegreat:
2 is right or not?
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TAN80-TAN10/TAN70=
TAN80-COT(90-80)/TAN70=
TAN80-COT80/TAN70=0
TAN80-COT(90-80)/TAN70=
TAN80-COT80/TAN70=0
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