Tg97°×ctg197°×cos297°
Tg97° = -0.410321
Ctg197° = -0.760929
Cos297° = -0.11921 ⇒
-0.410321*(-0.760929)* (-0.11921) = -0.03722
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Tg97° = -0.410321
Ctg197° = -0.760929
Cos297° = -0.11921 ⇒
-0.410321*(-0.760929)* (-0.11921) = -0.03722