NDA2018MathematicsTrigonometric Ratios & IdentitiesActual
What is 5 x- 3 x 5 x+ 3 x equal to?
Options
- Asin x
- Bcos x
- Ctan x
- Dcot x
Correct answer
C. tan x
Step-by-step solution
aligned & 5 x- 3 x 5 x+ 3 x & c- d=2 ( c+d 2 ) ( c-d 2 ) & c- d=2 ( c+d 2 ) ( c-d 2 ) & 5 x- 3 x 5 x+ 3 x = 2 ( 5 x+3 x 2 ) ( 5 x-3 x 2 ) 2 ( 5 x+3 x 2 ) ( 5 x-3 x 2 ) & = ( 2 x 2 ) ( 2 x 2 ) = x x = x aligned