I need help with a math equation

Question

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524

2

the question is:

(cos(pi/6))(sin(pi/5))-(sin(pi/6))(cos(pi/5))

and the answers are either:

a) cos(11/30 pi)

b) sin (11/30 pi)

c) cos (pi/30)

d) sin (pi/30)

Guest Jan 9, 2017

edited by Guest Jan 9, 2017
edited by Guest Jan 9, 2017

Guest · Answer 1 · 2017-01-09T08:36:29

It's D sin(pi/30)

CPhill · Answer 2 · 2017-01-10T07:57:47

Using ...... sin (A - B) = sinAcosB - sinBcosA ......and we have.....

(cos(pi/6))(sin(pi/5))-(sin(pi/6))(cos(pi/5)) =

sin( pi/5 - pi/6) =

sin (pi / 30)