Theninja888
Theninja888 Theninja888
  • 17-06-2016
  • Mathematics
contestada

Verify the identity. (7 points)

cos quantity x plus pi divided by two = -sin x

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jhonyy9
jhonyy9 jhonyy9
  • 17-06-2016
do you think 

cos(x + pi/2) = -sin x    ? 

so hopw you learned about formula cos(a+b) = ?
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