Homework Help: pre calc

Posted by Anonymous on Thursday, July 12, 2012 at 11:46am.

use an appropiate half-angle formula to find the exact value ofthe expression.
tan22.5

write the product as a sum
sinxsin5x

write the sum as a product
sin2x-sin7x

pre calc - JQuiroz, Sunday, May 26, 2013 at 7:17pm
sinxsin5x
sinucosv= 1/2[cos(u-v)-cos(u+v)]

= 1/2[cos(x-5x)-cos(x+5x)]

= 1/2[cos(-4x)-cos(6x)]

= 1/2cos4x-1/2cos6x

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