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OpenStudy (anonymous):
why is tan(90+Theta)=-cot Theta?
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OpenStudy (shubhamsrg):
you agree that tan(90-x) = cot x?
OpenStudy (anonymous):
Yep
OpenStudy (shubhamsrg):
just substitute x as -x over there..
OpenStudy (anonymous):
so it means that since tan(90-x)=cot x, tan(90-(-x))=-cotx?
OpenStudy (shubhamsrg):
cot(-x) = -cotx ..thats why..
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OpenStudy (anonymous):
ok thx!:)
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