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-   -   Acute angles (https://www.askmehelpdesk.com/showthread.php?t=76416)

  • Mar 27, 2007, 08:29 AM
    skr_girl
    Acute angles
    If α, β are acute angles such that Sin = 1/12 and Cos β = 4/5

    Calculate the six trigonometric functions for the sum and differences of the two angles….
  • Mar 28, 2007, 01:35 PM
    vrooje
    Did you mean ? There's no angle in the first one, and I'm going to assume you meant .

    Do you have trig identities for the sum and difference of angles? e.g. and such?

    I suggest that you think of the givens in terms of right triangles, and use SOHCAHTOA and the pythagorean theorem to find and .

    Then use the identities to compute the sine and cosine of the summed and differenced angles, and from there try to get all six trigonometric functions.

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