sin(x+π/2)=cos x cos(x+π/2)=-sinx tan(x+π/2)=sin(x+π/2)÷cos(x+π/2)=cos x÷(-sinx) = -cotx cot(x+π/2)=1÷tan(x+π/2)=1÷(-cotx)= - tan x sec(x+π/2)=1÷cos(x+π/2)=1÷(-sinx)=(-1/sinx) csc(x+π/2)=1÷sin(x+π/2)=1÷(cos x)=1/cosx sin(x+π)=-sinx cos(x+π)=-cosx tan(x+π)=sin(x+π)÷cos(x+π)=(-sinx)÷(-cosx)=tan x cot(x+π)=1÷tan(x+π)=1÷tan x = cot x sec(x+π)=1÷cos(x+π)=1÷(-cosx)=(-1/cos x) csc(x+π)=1÷sin(x+π)=1÷(-sinx)=(-1/sin x)