Pre cal question

[elvirae]

13)
Use sum-to-product formulas to find the solutions of the equation. (Use n as your arbitrary integer. Enter your answers as a comma-separated list.)

cos 5x + cos 7x = cos x

x=


11) Use sum-to-product formulas to find the solutions of the equation. (Use n as your arbitrary integer. Enter your answers as a comma-separated list.)

sin 3t + sin t = 0

t=

30)
Use inverse trigonometric functions to find the solutions of the equation that are in the given interval, and approximate the solutions to four decimal places. (Enter your answers as a comma-separated list.)
2 tan2 t + 6 tan t + 4 = 0
t=

 

[lev888]

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[Steven G]

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