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OpenStudy (dcolley):
Can someone help please Rewrite sec(65°) in terms of its cofunction
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OpenStudy (jamesj):
What is the cofunction of sec and what is its relation to sec? Hint: what is the relation between sin and cosin?
OpenStudy (dcolley):
Secant goes with cosign right? Its equal to the cofunction of angles complement
OpenStudy (jamesj):
cosec, yes. Now sin(90-x) = cos(x). Hence 1/cos(x) = 1/sin(90-x) which means by definition of sec and cosec that sec(x) = cosec(90-x)
OpenStudy (jamesj):
Got your answer then? sec(65) = cosec( .....what? ....)
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