- How to solve this Trig Equation: sec(theta)/cos(theta)?

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Do men from Mars have green skin and antennae? A man is 5 times as old as his son 2 years ago the sum of the squares of their age was 114 find the present age of son?answer is 7? How do I find the tangent plane to surface?
I need to find the tangent plane at (3,4,-3) for the equation:
x^2+y^2-z^2-4xy+4xz=-68? Is electricity more dangerous and destructive than fire? How do I find a complete list of human genes which have multiple splice variants?