sin(t)=cos(pi/2-t)
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The identity is easily proved by forming a rectangle using two identical right triangles. This Demonstration compares the curves
and
. The curves align when
.
Contributed by: Jon Perry (March 2011)
Open content licensed under CC BY-NC-SA
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"sin(t)=cos(pi/2-t)"
http://demonstrations.wolfram.com/SinTCosPi2T/
Wolfram Demonstrations Project
Published: March 7 2011