In spherical polar coordinates (r, [REPLACEMENT], φ), the polar angle [REPLACEMENT] represents the angle between the positive z-axis and the line connecting the point to the origin. The azimuthal angle φ represents the angle between the positive x-axis and the projection of the line connecting the point to the origin onto the xy-plane.

In this question, we are given the coordinates of a point P in spherical polar coordinates represented as (r, [REPLACEMENT], φ). We need to find the y-component of this point.

The y-component of a point is given by the product of the radial component (r) and the sine of the polar angle ([REPLACEMENT]). In this case, the radial component r is denoted as P. Therefore, the y-component of P is given by Psin[REPLACEMENT].

Now, comparing this with the options provided:

Option 1: Psinq sina

Option 2: Psinq cosa

Option 3: Pcosq sina

Option 4: Pcosq cosa

Out of these options, only option 1 matches the expression Psin[REPLACEMENT], which is the correct answer.

Therefore, the correct answer is option 1: Psinq sina.