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13 February, 01:49

Explain why (cos ((theta)) ? + (sin ((theta)) 2 = 1

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  1. 13 February, 02:08
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    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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