I need help with these problems.... 7. cos(x-y) if cosx=5/12 and cosy=11/12 8.tan(x=y)
Last edited by mr fantastic; Apr 25th 2009 at 05:27 AM. Reason: Moved from orignial thread
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Originally Posted by angelica2619 I need help with these problems.... 7. cos(x-y) if cosx=5/12 and cosy=11/12 8.tan(x=y) 8. makes no sense. It is incomplete and contains a typo. 7. Compound angle formula: cos(x - y) = cos x cos y + sin x sin y. Calculate sin x from cos x = 5/12. Calculate sin y from cos y = 11/12. Substitute everything into the above and simplify.
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