Question 927346
tan(7π/2) ={{{infinity}}}


tan(7π/2 - 2π/1) ={{{infinity}}}


tan(7π/2 - 4π/2)= {{{infinity}}}

tan(3π/2)= {{{infinity}}}


sin(75π) ={{{0}}}

sin(5π-4π)=sin(π) ={{{0}}}

sin(π) = {{{0}}} 


sec(9π/4) =sec(3π/2) ={{{infinity}}}

sec(9π/4 - 2π/1)=sec(9π/4 - 8π/4)=sec(π/4)={{{sqrt(2)/2 }}}

sec(9π/4 - 8π/4)={{{sqrt(2)/2 }}}

sec(π/4) ={{{sqrt(2)/2 }}}

1/cos(π/4) ={{{sqrt(2)}}}


cos(π/4) = {{{sqrt(2)/2 }}}

sin(-π/6) = {{{-1/2}}}