- cos 60
^{o} - Tan 60
^{o} - sin 60
^{o} - sin 30
^{o}

Option 3 : sin 60^{o}

Given:

2 × Cot 30°/ (1 + Cot2 30°)

Important trigonometric values

Calculation:

2 × Cot 30°/ (1 + Cot2 30°)

⇒ 2 × √3/(1 + (√3)^{2})

⇒ 2√3/4

⇒ √3/2

⇒ √3/2 = sin 60^{o}

**∴ sin 60 ^{o}.**

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