Straight Line Question 17
Question: The angle between the lines $ a_1x+b_1y+c_1=0 $ and $ a_2x+b_2y+c_2=0, $ is[MP PET 1994]
Options:
A) $ {{\tan }^{-1}}\frac{a_1b_2+a_2b_1}{a_1a_2-b_1b_2} $
B) $ {{\cot }^{-1}}\frac{a_1a_2+b_1b_2}{a_1b_2-a_2b_1} $
C) $ {{\cot }^{-1}}\frac{a_1b_1-a_2b_2}{a_1a_2+b_1b_2} $
D) $ {{\tan }^{-1}}\frac{a_1b_1-a_2b_2}{a_1a_2+b_1b_2} $
Correct Answer: B
Show Answer
Answer:
Solution:
BETA
