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What is the value of sin35° × cos55°?

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What is the value of sin35° × cos55°?
1. cos235° 
2. sin235° 
3. sin255° 
4. tan255° 
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Correct Answer - Option 2 : sin235° 

Given:

sin35° × cos55°

Concept used:

sin(90° - θ) = cosθ 

cos(90° - θ) = sinθ 

Calculation:

sin35° × cos55°

⇒ sin35° × cos(90° - 35°)

⇒ sin35° × sin35°

⇒ sin235° 

∴ The value is sin235°.

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