Which is an example of a secondary tillage

If cot5A = tan(3A-14˚), find the value of A? Given that 5A and 3A-14˚ are acute angles.

Simplify the following trigonometric expression:

If (3cos A - sin A) = 2 cos (90° - A), then find the value of cot A.

If sec A + tan A = 7 and sec A - tan A = (1/7), find the value of cos A.

What is the simplified value of the given expression?

3(sin² 50° + sin² 40°) + 6sin 30° - (3sec 60° + cot 45°)

Simplify the following trigonometric expression:
14 tan 25° cot 25° − 6 cos 39° sec 39°