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Verify the identity. (7 points) cos quantity x plus pi divided by two = -sin x
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1 vote
Verify the identity. (7 points)

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

User Zhi Zhou
by
8.5k points

1 Answer

3 votes
do you think

cos(x + pi/2) = -sin x ?

so hopw you learned about formula cos(a+b) = ?
User Matt Broatch
by
8.5k points
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