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What is Sin 20° Cos 70° + Cos 20° Sin 70°?

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What is Sin 20° Cos 70° + Cos 20° Sin 70°?
1. 2
2. 6
3. 5
4. 1
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1 Answer

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Correct Answer - Option 4 : 1

Concept

Sin(90°- A) = Cos A

Cos (90°- A) = Sin A

Calculation

Sin(90°– 70°) Cos 70°+ Cos(90° – 70°) Sin 70°

⇒ Cos 70°Cos 70°+ Sin 70°Sin 70°

⇒ Cos270 °+ Sin270°

⇒ 1
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