Connections between tan theta and tan(90 + theta)
1 answer:
Tan(90+ theta) = (tan90 + tantheta)/(1-tan90tantheta)
= ( sin90costheta + sintheta cos 90) / (cos90costheta - sin90sintheta))
= sin(90 + theta)/ cos(90+ theta) = costheta/-sintheta = - 1/tantheta
tan(90 + theta ) = -1/tantheta
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