Use a coterminal angle to find the exact value of the expression. Do not use a calculator.

Seleccione una respuesta.
a.
b.
c.
d.

Question

Use a coterminal angle to find the exact value of the expression. Do not use a calculator.

Seleccione una respuesta.
	 a. 	
	 b.   	
	 c. 	
	 d.

anonymous · Answer

are you spanish?
and where is the question and options

anonymous · Answer

$$\cos405$$

anonymous · Answer

cos405=cos(360+45)=cos45=1/root(2)

anonymous · Answer

to choose one answer

anonymous · Answer

No tengo idea de ángulo coterminal ....... lo siento

anonymous · Answer

but the answer i found is.707

ash2326 · Answer

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

ash2326 · Answer

$$1/\sqrt(2)$$=1/1.414=0.707

anonymous · Answer

but ash2326 , in options there is no .707

ash2326 · Answer

you wrote before that answer given is 0.707

anonymous · Answer

Use a coterminal angle to find the exact value of the expression. Do not use a calculator. $$\cos 405$$°

Choose the rifht answer:

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