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Solution 4.3:4e

From Förberedande kurs i matematik 1

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Current revision (14:20, 9 October 2008) (edit) (undo)
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The addition formula for sine gives us that
The addition formula for sine gives us that
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{{Displayed math||<math>\sin\Bigl(v+\frac{\pi}{4}\Bigr) = \sin v\cdot\cos\frac{\pi }{4} + \cos v\cdot\sin\frac{\pi}{4}\,\textrm{.}</math>}}
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<math>\sin \left( v+\frac{\pi }{4} \right)=\sin v\centerdot \cos \frac{\pi }{4}+\cos v\centerdot \sin \frac{\pi }{4}.</math>
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Because we know from exercise b that <math>\sin v = \sqrt{1-b^2}</math> we use that
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<math>\cos (\pi/4) = \sin (\pi/4) = 1/\!\sqrt{2}</math> to obtain
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{{Displayed math||<math>\sin\Bigl(v+\frac{\pi }{4}\Bigr) = \sqrt{1-b^2}\cdot\frac{1}{\sqrt{2}} + b\cdot\frac{1}{\sqrt{2}}\,\textrm{.}</math>}}
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Because we know from exercise b that
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<math>\sin v=\sqrt{1-b^{2}}</math>
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we use that
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<math>\cos \frac{\pi }{4}=\sin \frac{\pi }{4}=\frac{1}{\sqrt{2}}</math>
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to obtain
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<math>\sin \left( v+\frac{\pi }{4} \right)=\sqrt{1-b^{2}}\centerdot \frac{1}{\sqrt{2}}+b\centerdot \frac{1}{\sqrt{2}}.</math>
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Current revision

The addition formula for sine gives us that

sinv+4=sinvcos4+cosvsin4. 

Because we know from exercise b that sinv=1−b2  we use that cos(4)=sin(4)=12  to obtain

sinv+4=1−b212+b12. 
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