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tan20o+tan40o+sqrt(3) tan20otan40o is equal to

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+1 vote
by (735 points)
edited by
 
Best answer
20+40=60

tan(20+40)=tan60

(tan20+tan40)/(1-tan20tan40)=3^(1/2)

tan20+tan40=3^(1/2)-3^(1/2)*tan20*tan40

tan20+tan40+3^(1/2)tan20tan40=3^(1/2)

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