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26 February, 01:55

If sin 20 degree=a and cos20 degree=b then which of the following represents the correct value of sin 70 degree in terms of a and/or b?

1) a+b

2) a

3) b

4) a-b

+3
Answers (1)
  1. 26 February, 03:31
    0
    Sin70 = cos (90-70) = cos20

    Hence the second option is the answer
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