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August 28, 2016
Posted by **Kk** on Thursday, October 28, 2010 at 3:22pm.

Sin ( sin-1. 9/41 - cos-1 (-5/13)

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**Reiny**, Thursday, October 28, 2010 at 5:10pmlet sin-1. 9/41 = ß and cos-1 (-5/13 = Ø

so sin ß = 9/41 and cos ß = 40/41

and cosØ = -5/13 and sinØ = 12/13

then Sin ( sin-1. 9/41 - cos-1 (-5/13)

= sin(ß - Ø)

= sinßcosØ - cosßsinØ

= (9/41)(-5/13) - (40/41)(12/13) = -525/533