Here's the question you clicked on:
Sariah
Use a coterminal angle to find the exact value of the expression. Do not use a calculator. Seleccione una respuesta. a. b. c. d.
are you spanish? and where is the question and options
cos405=cos(360+45)=cos45=1/root(2)
No tengo idea de ángulo coterminal ....... lo siento
but the answer i found is.707
co405=cos(360+45) cos (A+B)=cosAcosB-sinAsinB cos(360+45)=cos(360)cos(45)-sin(360)sin(45) cos360=1 sin360=0 sin45=cos45=1/sqrt(2) so cos405=1/sqrt(2) or 0.707
\[1/\sqrt(2)\]=1/1.414=0.707
but ash2326 , in options there is no .707
you wrote before that answer given is 0.707
Use a coterminal angle to find the exact value of the expression. Do not use a calculator. \[\cos 405\]° Choose the rifht answer: |dw:1322555209852:dw|
sariah it's 1st option \[1/\sqrt(2) =\sqrt(2)/2\]