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`        If sin x ÷a= cos x ÷b , prove that a sin 2x + b cos 2x = b `
7 months ago

Arun
23760 Points
```							tan x = a/bcos x = b/ (a2+b2)1/2 ,  , sinx = a/ (a2+b2)1/2 b cos2x + a sin 2x = b (2cos2x-1) + a (2 sin x . cosx) b( 2 .b2/a2+b2-1) + a ( 2 .a/(a2+b2)1/2.b/(a2+b2)1/2= b(2b2- a2-b2)/a2+b2 + (2a2b/ a2+b2) =b (b2-a2)/a2+b2 +2a2b/a2+b2 =b (b2-a2+2a2)/a2+b2= b = R.H.S
```
7 months 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