Hello all... just took a test in my pre calc class and got it back with a few wrong. We can correct them and then retake the test but im having trouble with corrections.
These are the ones that im having trouble with:
solve the equation -
2cos(πx + π/3) = - sqrt(2)
sin2x = sin6x
sin2x = -sqrt(2) * sin x
Im aware of the formulas and ive tried using them for these but am not getting any success.
for the first one i used arccosine after dividing each side by 2.. easy solve after that... got 5/12 and 11/12 but was marked wrong
for the second one i was not to sure but i said 0 was the answer.
for the last one i tried dividing by sin x and then using the formula sine2x = 2 sine x cos x... then turning the left side to 2sin x tan x. After dividing by 2 you can solve but still got the wrong answers...
Help would be a great thing and thanks in advance for anyone who has any suggestions