Erwin G. answered 09/21/24
Experienced STEM Tutor Specializing in Math and Engineering
x= pi/2 + 2pi*n, x = 3pi/2 + 2pi*n <----------- solution
Erwin G. answered 09/21/24
Experienced STEM Tutor Specializing in Math and Engineering
x= pi/2 + 2pi*n, x = 3pi/2 + 2pi*n <----------- solution
Doug C. answered 09/20/24
Math Tutor with Reputation to make difficult concepts understandable
Solve by factoring.
cosx(7sinx+9) = 0
Set each factor equal to zero (zero product property_.
cos x = 0 or 7sinx + 9 = 0
For cos x = 0:
x = cos-1(0)
x = π/2 + kπ, k is any integer
For 7sinx + 9 = 0:
7sinx = -9
sinx = -9/7
x = sin-1(-9/7)
The solution set for this factor is empty set since there are no angles that have a sine of -9/7.
Visit this graph to see some of the solutions:
desmos.com/calculator/1ci7icoyny
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