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- Nov 12th 2006, 05:35 AM #1

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## a little help please

1. the angle A is standard position is defined in terms of the co-ordinates (x,y) of the terminal arm, and the radius r of the circle. the trigonometric functions of the angle A can be expressed in terms of x,y, and r. the expression r/x represents is?

2. how many solutions are there to the equation sin^2 x + sin x = 0 over the domain.

3. smallest positive angle that is equivalent to an angle of -2pi/3 is?

- Nov 12th 2006, 05:47 AM #2

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- Nov 12th 2006, 06:01 AM #3

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I assume by the domain you mean [0,2pi), we seek the points at which

sin^2(x)=-sin(x). Plot these and count them. See attachment, I make

it 3 (as the fourth is at 2pi which is outside the domain).

3. smallest positive angle that is equivalent to an angle of -2pi/3 is?

RonL