(14) Prove the following identity cos(x + y) + cos(x - y) = 2 cos(x) cos(y). Make sure you show all working and give clear explanations.

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A: In these questions we have to show some properties of triangle.

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A: We can evaluate the function in the following steps.

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A: Please refer to the image below

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A: angle of depression = 40  Therefore m∠CAB=90-40=50

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A: According to the company rule we can answer only first question and rest can be reposted.

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A: Let's find angle x+ y = ?

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A: r=a2+b2 here a = 1 b = 3

Q: 1) The point (-3,-4) lies on the terminal arm for angle 0. Determine the primary trigonometr ratios…

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Q: 15. Find the values of A, o, and for the function y = Asin (ox-6) so that the graph off matches the…

A: answer is in next step . please give a like !!

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A: We can check which statement is correct.

Q: 2. Find the equation of the curve whose slope at any point (x, y) is 6x - 1 and which passes the…

A: Dear learner, As per our guideline i can solve only one question at once further can be reposted.…

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Q: Find the perimeter of the figure below. Notice that one side length is not giver Assume that all…

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