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The minimum value of 9 cos2 θ + 36 sec2 θ is
If x = (sin 30 ° + cos 30 ° )/sec 60 ° , then find the value of 4x.
Find the value of tan(75°) using the identity for tan(A+B).
If 7sin² ϕ + 3cos² ϕ= 4, then find the value of ϕ ?
sin2 12˚ + sin2 14˚ + sin2 16˚ + sin2 18˚ + ……… + sin2 78˚ =?
A person is standing at a point 120 meters away from a tower. The angle of elevation to the top of the tower is 60°. If the height of the tower increas...
If (sinx + siny) = a and (cosx + cosy) = b, then find the value of (sinx siny + cosx cosy).
[A] (a²+b²-2)/ 2
[B] (a2-b2<...
