How do you express $cos( (15 pi)/ 8 ) * cos (( 2 pi) /3 )$ without using products of trigonometric functions?

Question

How do you express $cos( (15 pi)/ 8 ) * cos (( 2 pi) /3 )$ without using products of trigonometric functions?

1 Answer

Impact of this question

1632 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-05-14T05:14:30

$-(1/2)cos (pi/8)$

Explanation:

$P = cos ((15pi)/8)cos ((2pi)/3)$
trig table gives -->cos (2pi)/3 = - 1/2
$cos ((15pi)/8) = cos (-pi/8 + (16pi)/8) = cos (-pi/8 + 2pi) =$
$= cos (-pi/8) = cos (pi/8)$
Therefor, P can be expressed as:
$P = -(1/2)cos (pi/8)$

Science

Math

Humanities

... and beyond

How do you express $cos( (15 pi)/ 8 ) * cos (( 2 pi) /3 )$ without using products of trigonometric functions?

1 Answer

Explanation:

Related questions

Impact of this question

Science

Math

Humanities

... and beyond

How do you express cos( (15 pi)/ 8 ) * cos (( 2 pi) /3 ) cos( (15 pi)/ 8 ) * cos (( 2 pi) /3 ) without using products of trigonometric functions?

1 Answer

Explanation:

Related questions

Impact of this question

How do you express $cos( (15 pi)/ 8 ) * cos (( 2 pi) /3 )$ without using products of trigonometric functions?