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cosA+cos2A+cos3A=o
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There are two answers

Step-by-step explanation:

Hope it is helpful....

there is no question content here, but you for the free points! : d

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c