Self
Exam
Numerical Ability
Prove that :
tan70 = tan20 + 2tan50
Read Solution (Total 1)
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- tan70=tan(50+20)
tan70=(tan50+tan20)/(1-tan50tan20)
tan70(1-tan50tan20)=tan50+tan20
tan70-tan70tan50tan20=tan50+tan20
tan70-tan(90-20)tan50tan20=tan50+tan20
tan70-cot20tan50tan20=tan50+tan20
tan70-(cot20tan20)tan50=tan50+tan20
tan70-(1)tan50=tan50+tan20
tan70-tan50=tan50+tan20
tan70=tan20+2tan50 - 10 years agoHelpfull: Yes(3) No(0)
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