7.07 Trigonometric Identities

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Given sin(−θ)= 1/5 and tan θ = √6/12. What is the value of cos θ

-(2√6/5)

cos(−θ)= √3/4, sin θ <0 What is the value of sin θ?

-(√13/4)

The angle θ lies in Quadrant II. cos θ =−(2/3) What is tan θ?

-(√5/2)

Rita is proving that the following trigonometric identity is true: cos (-θ) 1 ---------- = ----- -sin θ tan θ Which would be a first correct line of her proof?

cos θ 1 -------- = - ------- - sin θ tan θ

The angle θ lies in Quadrant IV. sin θ= −(2/3) What is cos θ?

√5/3


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