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Find the exact value by using a halfangle identity.
sin 22.5°
 one year ago
 one year ago
Find the exact value by using a halfangle identity. sin 22.5°
 one year ago
 one year ago

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abb0tBest ResponseYou've already chosen the best response.0
\[\sin(22.5) = \frac{ 45 }{ 2 }\] use ur double angle formula \[\sin(\frac{ 1 }{ 2 }*x) = 0 \pm \sqrt{\frac{ 1\cos(x) }{ 2 }}\] where x = 45.
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
Ans: \[\sqrt{\frac{ 2\sqrt{2} }{ 2 }}\]
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
there should only be a root on the numerator.
 one year ago

marasofia1616Best ResponseYou've already chosen the best response.0
Ok I got that I had to plug in 45 for the x's in the formula and I got that cos 45= \[\frac{ \sqrt{2} }{ 2 }\] how did you get \[\frac{ \sqrt{2\sqrt{2}} }{ 2 }\]?
 one year ago

marasofia1616Best ResponseYou've already chosen the best response.0
actually \[\frac{ \sqrt{2\sqrt{2}} }{ 2 }\] is not an option for answers
 one year ago
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