Determine All Solutions of the Equation in Radians $\cos ( s + t )$

question 306

Multiple Choice

Determine all solutions of the equation in radians.
-Find $\cos ( s + t )$ given that $\sin s = - \frac { 1 } { 2 }$ , with $s$ in quadrant IV, and $\sin t = \frac { 1 } { 4 }$ , with $t$ in quadrant II.

• A) \(- \frac { 4 \sqrt { 3 } + \sqrt { 15 } } { 11 }\)
• B) \(\frac { 1 + 3 \sqrt { 5 } } { 8 }\)
• C) \(\frac { 4 \sqrt { 3 } - \sqrt { 15 } } { 11 }\)
• D) \(\frac { 1 - 3 \sqrt { 5 } } { 8 }\)

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Definitions:

Optic Disks

The point in the eye where the optic nerve connects to the retina, lacking photoreceptors, and creating a blind spot.

Ganglion Cells

Neurons located in the retina that receive visual information from photoreceptors and transmit it to the brain.

Opponent-Process Theory

A theory of color perception that assumes that the visual system treats pairs of colors as opposing or antagonistic.

Ganglion Cells

Neurons located in the retina that receive visual information from photoreceptors via intermediate bipolar cells and transmit it to the brain.