fatasquadyt27 fatasquadyt27
  • 18-03-2020
  • Mathematics
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Explain why (cos((theta))? + (sin((theta))2 = 1

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Danboghiu66
Danboghiu66 Danboghiu66
  • 19-03-2020

Imagine a right triangle where a and b are the legs and c is the hypothenuse.

Pitagora: a²+b²=c²

Divide by c

(a/c)²+(b/c)²=1

But a/c=sin(B) and b/c=cos(B)

Thus sin² + cos² = 1

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