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19 November, 08:51

Connections between tan theta and tan (90 + theta)

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  1. 19 November, 10:51
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    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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