NDA2018MathematicsTrigonometric Ratios & IdentitiesActual
What is 105^ + 105^ equal to?
Options
- A50^
- B50^
- C1 2
- D0
Correct answer
C. 1 2
Step-by-step solution
aligned & Sin 105^ + 105^ & = (60^ +45^ )+ (60^ +45^ ) & = ( 60^ 45^ + 60^ 45^ )+ ( 60^ 45^ . & = 3 2 1 2 + 1 2 1 2 + 1 2 1 2 - 3 2 1 2 & = 2 2 2 = 1 2 aligned