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What is the value of sin 43°cos 47° + cos 43°sin 47° ?


1. – 1
2. 0
3. 1
4. 2

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Correct Answer - Option 3 : 1

Concept used:

sin(A + B) = sinA cosB + cosA sinB

Calculation:

sin 43°cos 47° + cos 43°sin 47°

by using; Sin (A + B) = SinA CosB + CosA SinB

⇒ sin 43°cos 47° + cos 43°sin 47° = sin (43° + 47°)

= sin 90° 

= 1

∴ sin 43°cos 47° + cos 43°sin 47° = 1

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