4(8x-8)=-192 what's that mean and can someone me asap

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°

For the word below, click on the drop-down arrows to select the root and its meaning. version