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Grade: 12th pass 

                        
Prove that, tan70 =tan20+2tan50 2 . Prove that, (sinX) 3 × sin3X +(cosX) 3 × cos3X =(cos2X) 3
2 years ago

Answers : (2)

Anish Singhal
askIITians Faculty
1194 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
2 years ago
Saurabh Koranglekar
askIITians Faculty
8407 Points 
							576-2290_1.PNG
2 years ago
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