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  1. The value of the following is
    sin 47°+cos 43°- 4cos²45°
    cos 43°sin 47°
    1. - 1
    2. 0
    3. 1
    4. 1
      2
Correct Option: B

sin47° = sin(90° – 43°) = cos43°

= 1 + 1 – 4 ×
1
= 2 – 2 = 0
2


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