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anonymous

  • 5 years ago

What is the exact value of cos75* cos15*+ sin75* sin15* *=Degrees

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  1. anonymous
    • 5 years ago
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    note that cos(a) = sin(90-A)

  2. anonymous
    • 5 years ago
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    the value is cheddar cheese

  3. anonymous
    • 5 years ago
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    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 ...

  4. anonymous
    • 5 years ago
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    chedddar cheese

  5. anonymous
    • 5 years ago
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    Use the following identity to find the value: \[\cos(A-B)=\cos A \cos B+\sin A \sin B\]

  6. anonymous
    • 5 years ago
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    ah yes, anwar is right, ignore my answer. I spaced out on the identity stuff.

  7. anonymous
    • 5 years ago
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    ^^ I am always right :P

  8. anonymous
    • 5 years ago
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    So, what do you think the value would be?

  9. anonymous
    • 5 years ago
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    Thank you for helping though still :] Hhaha ok now am i right about the chart thing..

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