Provide the first five terms of the following sequence: t1=4 tn=5tn-1

The trigonometric ratios sine and secant are reciprocals of each other

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.