1.
The minimum value of 2sin2 θ + 3cos2 θ is ?

2.
Maximum value of (2sinθ + 3cosθ) is?

3.
The equation $${\cos ^2}\theta $$  = $$\frac{{{{\left( {x + y} \right)}^2}}}{{4xy}}$$   is only possible when ?

4.
The greatest value of sin4θ + cos4θ is?

5.
Which one of the following is true for 0° < θ < 90° ?

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