exam Maths Puzzle Numerical Ability

tan^2x-sin^2x= tan^2x sin^2x

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exam Other Question

How do I solve using two equations with two variables?

The units digit of a two-digit number is 4 times the tens digit. If the digits are reversed, the new number is 54 more than the original number. Find the number. 3x+2y=-2
2x-3z=1
0.4x-0.5z=-2.1