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cos130° cos40° + sin130° sin40° is equal to
  • a)
    0
  • b)
    1
  • c)
    1/2
  • d)
    not defined
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
cos130° cos40° + sin130° sin40° is equal toa)0b)1c...
Cos(a)cos(b) + sin(a)sin(b) = cos(a-b)


cos(130-40) = cos(90) = 0
This question is part of UPSC exam. View all JEE courses
Most Upvoted Answer
cos130° cos40° + sin130° sin40° is equal toa)0b)1c...
Answer is a)0 because cos 130cos 40+sin 130sin 40 = cos (130-40) = cos 90 =0
Community Answer
cos130° cos40° + sin130° sin40° is equal toa)0b)1c...
Cos a cos b + sin a sin b=cos (a-b)
so cos (130-40)=cos 90 =0
option A is correct
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cos130° cos40° + sin130° sin40° is equal toa)0b)1c)1/2d)not definedCorrect answer is option 'A'. Can you explain this answer?
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