RRB Group-D Model Paper 13 with answers for online practice

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Question : 88 of 100

Marks: +1, -0

2 ×{ tan 30°}/ (1 + tan^2 30°)

equals:

$sin 60°$
$cos 60°$
$tan 60°$
$sin 30°$

Solution:

2 × tan 30°/ (1 + tan^2 30°) = (2 × 1/√3) / (1 + (1/√3)2

⇒

(2/√3) / (1 + 1/3)

⇒

(2/√3) / (4/3)

⇒

(2/√3) × (3/4)

⇒

√3/2

= sin 60°

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