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Grade: 12th pass
        
  1. Prove that, tan70 =tan20+2tan50
        2 . Prove that,
(sinX)× sin3X +(cosX)3 × cos3X =(cos2X)3
11 months ago

Answers : (2)

Anish Singhal
askIITians Faculty
1199 Points
							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
11 months ago
Saurabh Koranglekar
askIITians Faculty
2729 Points
							576-2290_1.PNG
						
11 months ago
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