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anonymous
 5 years ago
Use identities (no calculators) to nd the exact value for (sin pi/4)(cos pi/2) + (cos pi/4)(sin pi/2)
anonymous
 5 years ago
Use identities (no calculators) to nd the exact value for (sin pi/4)(cos pi/2) + (cos pi/4)(sin pi/2)

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0this ones the hardest of them all

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but if you have a look at it, see what expansion it looks like

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0and it becomes pretty easy

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0this = sin(pi/4 + pi)??

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0=sin 3/4 pi = sin 75 degrees

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0can sin 75 degrees be written in surd form?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0but sin75 can be written in surd form

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0no hold om 3/4 pi = 3/4 X 180 = 135 degrees ruyght?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0in which case sin 135 = 1 /sqrt 2

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you can use sum angles expansion to find exact value of sin75 sin75 = sin(30+45) = sin30cos45+cos30sin45

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0my brains not working to well today !

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Mathematica returns zero after entering the problem expression. The left side of the + sign is zero because Sin[Pi]= zero. Same way for the right side.

watchmath
 5 years ago
Best ResponseYou've already chosen the best response.0It is equal to \(\sin(\frac{\pi}{4}+\frac{\pi}{2})=\sin(3\pi/4)=\sqrt{2}/2\)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0(Sin pi/4) was processed as Sin(pi)/4 by Mathematica.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Wolfram may be incorrect but they are reporting that \[\text{Sin}\left[\frac{3 \pi }{4}\right]=\frac{1}{\sqrt{2}}\]
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