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List of top Mathematics Questions on Trigonometric Equations

If \( 0 \leq a, b \leq 3 \) and the equation \( x^2 + 4 + 3\cos(ax + b) = 2x \) has real solutions, then the value of \( (a + b) \) is:
The solution set of the equation \( \tan(\pi \tan x) = \cot(\pi \cot x) \), \( x \in \left(0, \frac{\pi}{2}\right) \), is:
Principal Solution of $ (5 \sin \theta)(2 \cos \theta + 1) = 0 $
Which of the following expressions represents the Principal Solution