What is the simplified value of $(cos^{4} A - sin^{4} A)$?
1). 0
2). $2cos^{2}A$
3). $cos 2A$
4). 1
3. If tan θ = 2√6/5 and θ is acute, then cosec θ is
4. The minimum value of $2sin^{2}\theta + 3cos^{2}\theta$ is
5. If 0° < θ < 90° and 2 sin x + 15 cos2x = 7, then value of tan x -
6. Find the value of θ for (sinθ + cosecθ) = 2.5, where 0° < θ < 90°
7. If $\frac{secA}{(secA - 1)} + \frac{secA}{(secA + 1)} = x$, then x is
8. The value of $cos 1^{0} cos 2^{0} cos 3^{0} ..... cos 180^{0}$ is
9. The simplified value of $(sec x sec y + tan x tan y)^{2} - (sec x tan y + tan x sec y)^{2}$ is :
10. What is the slope of the line parallel to the line passing through the points (5, -1) and (4, -4)?