anonymous
  • anonymous
Find an exact value. cos 15°
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
1 Attachment
RadEn
  • RadEn
setting 15 = (45-30)
RadEn
  • RadEn
then use the formula : cos(A-B) = cosAcosB + sinAsinB

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RadEn
  • RadEn
here given A=45 and B=30 degrees
anonymous
  • anonymous
cos 45cos30 +sin45cos30?
RadEn
  • RadEn
45 and 30 are the special angles.. u have to remember the values of sin and cos for angles 30 and 45 degrees
anonymous
  • anonymous
ok. how do i solve from here?
RadEn
  • RadEn
u just put the values of them (sin45, sin 30, cos45, cos 30)
RadEn
  • RadEn
cos 45cos30 +sin45cos30 = ... (calculate it and simply)
anonymous
  • anonymous
i got this
RadEn
  • RadEn
hmm.. what identity did u use ? it should be : cos 45cos30 +sin45cos30 do u know the exactly value of sin30 ? sin45 ? cos30 ? cos45 ?
anonymous
  • anonymous
just put the values cos45 =1/root 2 and cos 30= root3/2
anonymous
  • anonymous
sin 45=1/root ovr2 and sin 30=1/2...the multiply and add
anonymous
  • anonymous
1/root ovr2 or 1/ root 2?
anonymous
  • anonymous
its the same thing...
anonymous
  • anonymous
o

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