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AnnaNika
AnnaNika AnnaNika
  • 25-03-2016
  • Mathematics
Answered

Given that cos42° is simpler to 0.743, What is the sine of the complementary angle?

Verified Answer :

Anonymous Anonymous
  • 25-03-2016

cos(42)=sin(90-42)

So in this case:

cos(42)=sin(48)

As:

A complementary angle is either of two angles whose sum is 90 degrees. {Source: Google}

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AL2006
AL2006 AL2006
  • 25-03-2016

The cos of an angle and the sine of its complement are the same number.
Spend a couple of minutes looking at a right triangle, and reviewing the definitions of sin and cos, and you'll see why.

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