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  1. If q be an acute angle and 7 sin²θ + 3 cos²θ = 4, then the value of tan θ is
    1. 3
    2. 1
      3
    3. 1
    4. 0
Correct Option: B

7 sin²θ + 3cos²θ = 4

⇒ 7
sin²θ
+ 3 =
4
= 4 sec²θ
cos²θcos²θ

⇒ 7 tan²θ + 3 = 4(1+ tan²θ)
⇒ 7 tan²θ – 4 tan²θ = 4 – 3
⇒ 3 tan²θ = 1
⇒ tan²θ =
1
3

⇒ tan θ =
1
3



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