Latest Self Aptitude Question SOLUTION: Prove that : tan70 = tan20 + 2tan50

• Placement Papers
• /
• Self
• /
• Numerical Ability

Self Question Papers:

(#M40032924) SELF Numerical Ability question Trigonometry Keep an EYE

Prove that :
tan70 = tan20 + 2tan50

Akanksha Mishra (10 years ago)

Solved Mallela Srilakshmi Read Solution (1)

Is this Puzzle helpful?   (7)   (3) Submit Your Solution

Read Solution (1) :

Mallela Srilakshmi  (10 years ago)

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

Is this solution Helpfull? Yes (3) | No   

Please Login to Read Solution.