1.What is the value of sinθ given that (3, −7) is a point on the terminal side of θ ? A. −(3√58/58) B. 7√58/58 C. −(7√58/58) D.3√58/58
2.The line with equation x + y = 0 coincides with the terminal side of an angle θ in standard position in Quadrant II .
What is the value of tanθ ?
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3.What is the reference angle for the angle with measure −(π/4) ?
Start by plotting the point in the number plane.
Then you can use pythagoras's theorum to work out the value of the sides in the right angle triangle with the point given. that is (0,0) (3,-7) (3,0)
You are in the 4th quad so sine will be negative.