Question

Find the exact value of sin75 using any appropriate formulas.
help please :D

Answer 1

@ganeshie8

Answer 2

@Loser66

Answer 3

sin75 is the same as sin(45+30)

Answer 4

from there you do sin30*cos45+cos30*sin45

Answer 5

oh ok

Answer 6

which if you find those coordinates
= \[1/2 * \sqrt{2}/2 + \sqrt{3}/2 * \sqrt{2}/2\]

Answer 7

= \[\sqrt{2}/4+\sqrt{6}/4\]

Answer 8

ty so much

Answer 9

can u help with another question?

Answer 10

combine you get \[(\sqrt{2} + \sqrt{6})/\]

Answer 11

/4

Answer 12

sure thing and ya i can help

Answer 13

find the exact value of [\sec ^{2}(2\pi/3)+\tan(5\pi/4)(\cos \pi/3)\]

Answer 14

ah crap let me re write it

Answer 15

haha sure thing

Answer 16

\[\sec ^{2}(2\pi/3)+\tan(5\pi/4)(\cos \pi/3)\]

Answer 17

finally lol

Answer 18

haha ok gimme a sec to figure out how to do it and then how to explain it XD

Answer 19

no problem :D

Answer 20

are you trying to find the # value or just simplify it?

Answer 21

because sec^2(2pi/3) = 4

Answer 22

it says find the exact value

Answer 23

i know the answer but idk how to get it

Answer 24

the answer is 4.5

Answer 25

ok well then the other half =.5 then XD ok.....so to solve the first part....gimme sec to type this out

Answer 26

sec^2(2pi/3) is the same as saying (sec(2pi/3))^2

Answer 27

would i have to jsut type all this into a calculator?

Answer 28

that you can then change to (1/cos(pi/3)^2

Answer 29

im sure you could but its fine, i can just explain it here

Answer 30

cos(pi/3)= 1/2 so you have (1/1/2)^2 = (2)^2 = 4

Answer 31

yea i think i understand this now haha

Answer 32

i got one more if you are up for it :D

Answer 33

sure

Answer 34

solve for x to the nearest degree over 0<x<360 in the equation \[4\cos x-3secx=2\]

Answer 35

you are suppose to multiply by cosx right?

Answer 36

and get \[4\cos ^{2}x-3=\]

Answer 37

2cosx

Answer 38

ya

Answer 39

i get stuck here on what to do next

Answer 40

ok...let me see.....

Answer 41

here, one sec ill be right back

Answer 42

ok

Answer 43

ok so, im double checking, but i got undefined as my answer....

Answer 44

the answer key says its 131 and 229

Answer 45

but i coudlnt get an answer either so idk

Answer 46

sorry.