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jolli1 [7]
4 years ago
11

Where does the pythagorean identity sin^2 + cos^2=1 come from? How does it relate to right triangles?

Mathematics
1 answer:
Arada [10]4 years ago
8 0
Consider a<span> right triangle with </span><span>hypotenuse of 1.
sin x means to divide the side in front of the angle by </span>hypotenuse<span>
cos x means to divide the side beside  the angle by hypotenuse
we know that a^2+b^2=c^2 now divide two sides by c^2
\frac{ a^{2} }{ c^{2} }+  \frac{ b^{2} }{ c^{2} }=1
c is 1 also a/c means sinx and b/c is cos x so
sin^2(x)+cos^2(x)=1

</span>



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antoniya [11.8K]
Original cost of the necklace = $28
Percentage by which the store reduces the price of the necklace = 20%
Amount of discount given
by the store on the necklace = (20/100) * 28
                                               = 28/5 dollars
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So Janet will pay 20.4 dollars for the necklace.    
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Read 2 more answers
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