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cos 20° + cos 100° + cos 140° + cos 90° का मान बराबर है
  • a)
    √3/2
  • b)
    -2
  • c)
    1
  • d)
    0
Correct answer is option 'D'. Can you explain this answer?
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cos 20° + cos 100° + cos 140° + cos 90° a)√3/...
cos 20° + cos 100° + cos 140° + cos 90°
= 2 cos 60° cos 40° + cos 140° + 0
= cos 40° + cos 140°
= 2 cos 90° cos 50° = 0
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cos 20° + cos 100° + cos 140° + cos 90° a)√3/2b)-2c)1d)0Correct answer is option 'D'. Can you explain this answer?
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