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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

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2 years ago

Anish Singhal
1194 Points
```							According to the trigonometric identity,tan70=tan(20+50)tan70=(tan20+tan50)/1-tan20tan50tan70-tan20tan50tan70=tan20+tan50Also tan70tan20=tan70cot70=1Hencetan70-tan50=tan20+tan50So tan70=tan20+2tan50
```
2 years ago
Saurabh Koranglekar
10341 Points
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2 years ago
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### Course Features

• 31 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions