Hello :
<span>5cosθ = 3cosθ - 1.
</span><span>5cosθ - 3cosθ = 1.
2cos</span>θ =1
cosθ =1/2
all solutions :
cosθ =cos<span>π<span>/3
</span></span>all solutions :
θ =π/3 +2kπ or θ = - π/3 +2kπ ....k in Z
3π/4 angle is in the second quadrant, so cos (3π/4) is going to be negative.
Reference angle of 3π/4 is (π - 3π/4) = π/4
cos(π/4) = √2/2
cos (3π/4) = - √2/2
Answer is C.
Answer: 9x^2-2x-1
Step-by-step explanation: hope this helps!
1/2 0.55 5/7 one half in decimal form is only .5 and 5/7 is much greater than 1/2 even more than .55
Answer:
Step-by-step explanation:
Given 
Apply minus-plus rules
