41.
$$\frac{{{\text{cos }}\alpha }}{{{\text{sin }}\beta }} = n$$   and $$\frac{{{\text{cos }}\alpha }}{{{\text{cos }}\beta }} = m,$$   then the value of $${\text{co}}{{\text{s}}^2}\beta $$   is?

42.
If tanθ + cotθ = 5, then tan2θ + cot2θ is?

43.
If tanA = n tanB and sinA = m sinB, then the value of cos2A = ?

44.
The value of tan 4°.tan 43°.tan 47°.tan 86° is?

45.
The value of tan 1°.tan 2°.tan 3° ............. tan 89° is?

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