trig functions

Question

Use a sum or difference formula to determine the value of the trigonometric function.cos(9 pi/4+ 5 pi/6

Mark M. · Accepted Answer

cos(9π/4 + 5π/6) = cos(9π/4)cos(5π/6) - sin(9π/4)sin(5π/6)
 
                           = (√2/2)(-√3/2) - (√2/2)(1/2)
 
                           = (-√6 - √2)/4

trig functions

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trig functions

1 Expert Answer

Still looking for help? Get the right answer, fast.

OR

RELATED TOPICS

RELATED QUESTIONS

on the same axis sketch the graphs of y=x2-3, and the graph of y=2x use the sketch to find the solution of x2-3=2x

find the equation of the horizontal line passing through the points (-2,3)

Assume f(x)=4x-8 and g(x)=5 what is the value of (f+g)(2) this is hard. ive tried, but i cant do this.

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