anonymous
  • anonymous
What is the exact value of cos75* cos15*+ sin75* sin15* *=Degrees
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
note that cos(a) = sin(90-A)
anonymous
  • anonymous
the value is cheddar cheese
anonymous
  • anonymous
so Cos 75=sin(90-75).......... i am being taught with the formulas sin (A+B)= sinA cosB + cosA sinB also cos (A+B)= cosA cosB - sinAsinB.... Do you know that one i know i have to use a 30 45 60 chart of sin cos and tan with raidiacles and franctions and fill in i just dont know how ...

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anonymous
  • anonymous
chedddar cheese
anonymous
  • anonymous
Use the following identity to find the value: \[\cos(A-B)=\cos A \cos B+\sin A \sin B\]
anonymous
  • anonymous
ah yes, anwar is right, ignore my answer. I spaced out on the identity stuff.
anonymous
  • anonymous
^^ I am always right :P
anonymous
  • anonymous
So, what do you think the value would be?
anonymous
  • anonymous
Thank you for helping though still :] Hhaha ok now am i right about the chart thing..

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