math

I don't know what to do. Could you show me how to solve these two problems? Solve for x: sin x = cos x Solve for x: cos x - 6 sec x = 1 Both are 0 is less than or equal to x and x is less than or equal to 2 Pi

polar coordinates

The polar coordinates of a point (-1, -pi/3), find the rectangular coordinates for that point.

standard form

write the expression i^6-5 in the standard form a + bi

||v||

If v=3i-4j, find ||v||

Identities

I have a attachment of 2 problems of which I am trying to solve. For both of theses problem, I am to derive an expression. Derive a Trigonometric expression. Please see attached.