2012 · Q96
Consider the following:
- 1(cot 30 + 1)/(cot 30 - 1) = 2(cos 30 + 1) 2. 2 sin 45 cos 45 - tan 45 cot 45 = 0.
Which of the above identities is/are correct?
Elementary MathematicsTrigonometry
- A1 only
- B2 only
- CBoth 1 and 2
- DNeither 1 nor 2
Explanation
LHS of 1 equals (sqrt(3)+1)/(sqrt(3)-1) = 2+sqrt(3) = RHS; LHS of 2 equals 2*(1/2)-1 = 0.