Answer:
B
Step-by-step explanation:
Using a trigonometric identity, since in the first quadrant and in the third quadrant the sine and the cosine have the same sign, is always positive.
<h3>What is the trigonometric identity for sin 2θ?</h3>
It is given by:
In the first quadrant(0° < θ < 90°) and in the third(180° < θ < 270°), the sine and the cosine have the same sign, hence the multiplication is positive and is always positive.
More can be learned about trigonometric identities at brainly.com/question/24496175
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Formula for slope-intercept is y = mx+b. The y-intercept is the point where the line crosses the y-axis. From there on, use the slope to graph the line. For example, if the equation is y = 5x - 2, you would want to plot (0,-2) first on the graph. Then, continue using the slope, which is 5. Slope is rise/run. In this case, you go up five, then to the right one, since there is always an invisible one if the slope is a whole number.
Hope that helped. :)
90-n=3n
90=4n
22.5=n
Final answer 22.5