- Prove that, tan70 =tan20+2tan50
2 . Prove that,(sinX)3 × sin3X +(cosX)3 × cos3X =(cos2X)3
- Prove that, tan70 =tan20+2tan50
2 . Prove that,
(sinX)3 × sin3X +(cosX)3 × cos3X =(cos2X)3
Mohammed , 6 Years ago
Grade 12th pass
Trigonometry> Prove that, tan70 =tan20+2tan50 2 . Prove...
2 AnswersAnish Singhal
Last Activity: 6 Years ago
According to the trigonometric identity,
tan70=tan(20+50)
tan70=(tan20+tan50)/1-tan20tan50
tan70-tan20tan50tan70=tan20+tan50
Also tan70tan20=tan70cot70=1
Hence
tan70-tan50=tan20+tan50
So tan70=tan20+2tan50
Saurabh Koranglekar
Last Activity: 6 Years ago
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