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anonymous

  • 5 years ago

simple trig problem help! simplify the following.. cos(7π/126º)cos(36º/5)+sin(7π/126º)sin(36º/5)

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  1. anonymous
    • 5 years ago
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    cos(7pi/ 126 - 36pi/5) . cosine formula !!!!

  2. anonymous
    • 5 years ago
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    i'm not exactly following...

  3. anonymous
    • 5 years ago
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    cosA cosB + sinA sinB = cos (A-B)

  4. anonymous
    • 5 years ago
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    then shouldn't it be cos(7π/126º-36º/5) ? you had put B=36π/5...

  5. anonymous
    • 5 years ago
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    sry...typed wrongly...my bad

  6. anonymous
    • 5 years ago
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    but

  7. anonymous
    • 5 years ago
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    the angle must be in DEGREES or RADIANS.,,,u can NOT use both

  8. anonymous
    • 5 years ago
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    so then my answer would be correct so long as i take away the degrees sign?

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spraguer (Moderator)
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