The function f(t) = 3 cos(pi/6t) + 5 represents the tide in Blastic Sea. It has a maximum of 8 feet when time (t) is 0 and a minimum of 2 feet. The sea repeats this cycle every 12 hours. After nine hours, how high is the tide?

Question

anonymous · Answer

@amistre64 
@Nurali 
@robtobey

amistre64 · Answer

let t=9

anonymous · Answer

yes i subsituted it into the equation and got 9.701 and thats not a choice

amistre64 · Answer

http://www.wolframalpha.com/input/?i=+3+cos%289pi%2F6%29+%2B+5 set your calc to radian mode maybe?

anonymous · Answer

the answer is 5?

anonymous · Answer

well schitt mines was in degrees thanks

anonymous · Answer

could you help with another man?

amistre64 · Answer

maybe

anonymous · Answer

k

anonymous · Answer

Simplify: (sin Θ − cos Θ)2 − (sin Θ - cos Θ)2

amistre64 · Answer

its a difference of squares

anonymous · Answer

Simplify: (sin Θ − cos Θ)^2 − (sin Θ - cos Θ)^2

amistre64 · Answer

x^2 - a^2 = (x-a)(x+a)

anonymous · Answer

?

amistre64 · Answer

isnt that just zero?

anonymous · Answer

well thats a choice

amistre64 · Answer

let sin-cos = r

r^2 - r^2 = 0

anonymous · Answer

hmm

anonymous · Answer

is zero the answer i was leaning towards sin^2

amistre64 · Answer

assuming theres no mistype in it

amistre64 · Answer

you have:$$(\color{red}{sin-cos})^2\color{green}-(\color{red}{sin-cos})^2$$
$$(\color{red}{r})^2\color{green}-(\color{red}{r})^2$$

anonymous · Answer

so its basically like adding 1 and negative 1?

amistre64 · Answer

yeh

anonymous · Answer

k how about another man?

anonymous · Answer

your a great help

anonymous · Answer

What is the sine value of 5 pi over 3?

anonymous · Answer

@amistre64

anonymous · Answer

@amistre64  i need one more plz man

amistre64 · Answer

calculator sin(5pi/3)  thats the best i could work it

amistre64 · Answer

its the same as 6pi/3 - pi/3

so id say it the sin of 60 degrees

anonymous · Answer

i actually figured it out