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If cos130 = a, tan50 If cos130 = a, tan50=
cos50°=﹣a
sin50°=√﹙1－a²﹚
tan50°=﹣√﹙1－a²﹚/a
As the title~
Cos130 equals
cos(130)=-0.3673
If sin40 ° is known to be a, then cos130 ° is equal to a
Such as the title
cos130°=cos(90°+40°)=-sin40°=-a
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