Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

If $3sin^2 A + 4 cos^2 A - 3 = 0, $ then the value of cot A (where 0 ≤ A ≤ 90°) is :

Options:

0

1

not defined

Correct Answer:

0

Explanation:

3 sin²A + 4 cos²A - 3 = 0

3 sin²A + 3 cos²A + cos²A - 3 = 0

3 +  cos²A - 3 = 0   { sin²A + cos²A = 1 }

  cos²A  = 0

{ we know, cos 90º = 0 }

So,  A = 90º

Now,

cotA

= cot 90º 

= 0