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OpenStudy (crashonce):
tan 70 - tan 20 = 2 cot 40
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OpenStudy (help!!!!):
Can not solve
OpenStudy (help!!!!):
http://symbolab.com/solver/step_by_step/%5Ctan(70)-%5Ctan(20)%3D2%5Ccot(40)/?origin=button
OpenStudy (crashonce):
can u use proper trig identities?
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