SOLUTION: Let {{{ g(x) = (x) sqrt(64x^2+25) }}} and {{{ h(t)=(5/8)cot(t) }}} for {{{ 0<t<pi/2 }}} find g(h(t)), simplify and write the answer in terms of sin(t) and cos(t) please give ste

Algebra ->  Trigonometry-basics -> SOLUTION: Let {{{ g(x) = (x) sqrt(64x^2+25) }}} and {{{ h(t)=(5/8)cot(t) }}} for {{{ 0<t<pi/2 }}} find g(h(t)), simplify and write the answer in terms of sin(t) and cos(t) please give ste      Log On


   



Question 960989: Let +g%28x%29+=+%28x%29+sqrt%2864x%5E2%2B25%29+ and +h%28t%29=%285%2F8%29cot%28t%29+ for +0%3Ct%3Cpi%2F2+ find g(h(t)), simplify and write the answer in terms of sin(t) and cos(t)
please give steps how to solve
Thank you!

Answer by Edwin McCravy(20059) About Me  (Show Source):
You can put this solution on YOUR website!
+g%28x%29+=+%28x%29+sqrt%2864x%5E2%2B25%29+ and +h%28t%29=%285%2F8%29cot%28t%29+
+g%28h%28x%29%5E%22%22%29%22%22=%22%22%22%22=%22%22%22%22=%22%22

%22%22=%22%22%22%22=%22%22expr%285%2F8%29%5E%22%22cot%28t%29%2Asqrt%2825cot%5E2%28t%29%2B25%29+%22%22=%22%22

expr%285%2F8%29%5E%22%22cot%28t%29+sqrt%2825%28cot%5E2%28t%29%2B1%29%29+%22%22=%22%22expr%285%2F8%29%5E%22%22cot%28t%29%2A5%2Asqrt%28cot%5E2%28t%29%2B1%29+%22%22=%22%22expr%2825%2F8%29%5E%22%22cot%28t%29%2Asqrt%28cot%5E2%28t%29%2B1%29+%22%22=%22%22

There is an identity 1%2Bcot%5E2%28theta%29=csc%5E2%28theta%29

expr%2825%2F8%29%5E%22%22cot%28t%29%2Asqrt%28csc%5E2%28t%29%29+%22%22=%22%22

expr%2825%2F8%29%5E%22%22cot%28t%29%2Aabs%28csc%28t%29%29+%22%22=%22%22

Since t is in the first quadrant we can eliminate the absolute value:

expr%2825%2F8%29%5E%22%22cot%28t%29%2Acsc%28t%29+%22%22=%22%22

Use identities cot%28theta%29=cos%28theta%29%2Fsin%28theta%29 and csc%28theta%29=1%2Fsin%28theta%29

expr%2825%2F8%29expr%28cos%28t%29%2Fsin%28t%29%29%2Aexpr%281%2Fsin%28t%29%29+%22%22=%22%22

25cos%28t%29%2F8sin%5E2%28t%29

Edwin