Asked by Anonymous
Show that
sinx = (square root of) 1 - cos^2x
is not an identity
sinx = (square root of) 1 - cos^2x
is not an identity
Answers
Answered by
Reiny
All we need is one counterexample to show it is not an identity.
let x = 210º
LS = sin 210 = -1/2
RS = √(1- cos^2 (210º))
= √(.25)
= 1/2
So there!
let x = 210º
LS = sin 210 = -1/2
RS = √(1- cos^2 (210º))
= √(.25)
= 1/2
So there!
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