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3 years ago

If sin (13y-5) = cos (2y+5), then what is the value of y?

Mathematics

1 answer:

Xelga [282]3 years ago

3 0

Given sin (13y-5) = cos (2y+5)

We have a formula regarding complementary angles that is given as follows :-

If sin(A) = cos(B), then A + B = 90 degrees.

where A and B are complementary angles.

Comparing it with given information, we get A = (13y-5) and B = (2y+5).

So the sum of two angles A = (13y-5) and B = (2y+5) would be 90 degrees.

(13y-5)° + (2y+5)° = 90°

13y + 2y - 5 + 5 = 90°

15y = 90°

y = 6°

Hence, final answer is y = 6 degrees.

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Its not B. because , 13^2 = 169
Its for sure not C. because, 49^4 = 5,764,801
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Reason , because 14(14) = 196 = 14^2

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