What do we do if they give us the answer?like cos u = 7/25; find cos u/2, sin u/2, and tan u/2.

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Draw a RA tiangle. You will see the missing side is 24. At that point you can either rely on the cos value or use the sin value. For sin u/2 simply set up the sqrt((1-cosu)/2) Tan can be sinu/1+cosu OR sqrt((1-cosu)/(1+cosu))