Question

16. (cos A + sin A)?
+ (cos A – sin A)2 = 2cot A
​

Answer 1

Answer:

Explanation:

sin2x = cosx

2 sinx cosx = cosx

Therefore, either cos x = 0, or sinx = 1/2

x = (2n + 1)π/2, or x = nπ + (-1)^n π/6

To generalise the solution, we can take the union of these two possible values.

Answer 2

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