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1. If tan x =a/b prove that b cos x +a sin 2x =b. To prove ,CosecA+ 2cosec2A = sec A cot A/2 Cos a.cos2A.cos4A.cos8A

1. If tan x =a/b prove that b cos x +a sin 2x =b.            
  1. To prove ,CosecA+ 2cosec2A = sec A cot A/2    
  1. Cos a.cos2A.cos4A.cos8A             

Grade:11

1 Answers

Vikas TU
14149 Points
4 years ago
Dear Student,
tanx = a/b => sinx/cosx = a/b => bsinx = acosx.
2asinxcosx = 2bsin2x => asin2x = 2bsin2x => asin2x – bsin2x = bsin2x
=> asin2x + bcos2x – bsin2x = bcos2x + bsin2x => asin2x + bcos2x = b.
Cheers!!
Regards,
Vikas (B. Tech. 4th year
Thapar University)

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