Mathematics, 19.10.2019 14:30 roxy06

If cos a = 1/3 then the positive value of tan 1/2a is? i did radical 2/3 over 4/3, but im not sure what to do now.

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If cos a = 1/3 then the positive value of tan 1/2a is? i did radical 2/3 over 4/3, but im not sure...