Question 207158
They are both true. By definition, {{{csc(x)=1/sin(x)}}}. If you solve for {{{sin(x)}}}, you get {{{sin(x)=1/csc(x)}}}



Similarly, {{{sec(x)=1/cos(x)}}}. Isolating {{{cos(x)}}} gets you {{{cos(x)=1/sec(x)}}}



These identities are one of many which can be found <a href="http://www.sosmath.com/trig/Trig5/trig5/trig5.html">here</a>.