Mathematics: Post your doubts here!

[shaminou]

a bit lengthy

Take ur time dear and thnx for helping.

 

[Rutzaba]

first and foremost we take u= sinx
du/dx =cosx
dx= du/cosx
then we say if u = sinx
u^2= sin^2 x
1-u^2=1-sin^2 x
1-u^2= cos^2x
cosx= root of 1-u^2

 

[Rutzaba]

I dont get the question.

why dont you stop interrupting?????

 

[Haya Ahmed]

Guys Please I need the explanations for these questions ..
Solve x :

Q1 Tan(x) = -0.75 -180<= x <= 180
Q2 Sin (3x) = -0.5 0<= x <= 360


Thanks

 

[Thought blocker]

why dont you stop interrupting?????

:thumsup: Thats my job.

 

[Rutzaba]

then it wud be e^2u / root of 1-u^2
wch then wud be solved by by parts

 

[shaminou]

I dont get the question.

Relax, cool down and take a breath of fresh air. Don't stress.

 

[Rutzaba]

Relax, cool down and take a breath of fresh air. Don't stress.

did u understand wat ive dne?

 

[Rutzaba]

Relax, cool down and take a breath of fresh air. Don't stress.

the question is very big

 

[shaminou]

did u understand wat ive dne?

R u sure it must be solved by parts afterwards??

 

[Thought blocker]

Guys Please I need the explanations for these questions ..
Solve x :

Q1 Tan(x) = -0.75 -180<= x <= 180
Q2 Sin (3x) = -0.5 0<= x <= 360


Thanks

Q1 36.6?

 

[Rutzaba]

y = e^2 sin x, u = sin x. can u plz tell me a nice non-consuming time to display the calculations?

are u sure the question is correct? is it not e^ 2x sin?

 

[Haya Ahmed]

Rutzaba Thought blocker here is the question and the answers are
(a) = 143.1 , -36.9
(c) = 70 , 110,190,230 , 310 , 350

 

[Thought blocker]

Rutzaba Thought blocker here is the question and the answers are
(a) = 143.1 , -36.9
(c) = 70 , 110,190,230 , 310 , 350

4a) Tan inverse -0.75 = -36.9 and add 180 to get 143.1 for positive quadrant.

 

[RoOkaYya G]

Rutzaba Thought blocker here is the question and the answers are
(a) = 143.1 , -36.9
(c) = 70 , 110,190,230 , 310 , 350

tan inverse 0.75= 36.9
since its negative then its found in quadrant S and C
do 180-36.9=143.1
and 360-36.9=323.1 ----> to make it be in range -360 therefore 323.1-360=-36.9

 

[Thought blocker]

Rutzaba Thought blocker here is the question and the answers are
(a) = 143.1 , -36.9
(c) = 70 , 110,190,230 , 310 , 350

RoOkaYya G how to do c? :/

 

[RoOkaYya G]

RoOkaYya G how to do c? :/

wait ill do it

 

[Thought blocker]

wait ill do it

Starlight97 Rookz will do it.

 

[RoOkaYya G]

Starlight97 Rookz will do it.

r u sure the answers r correct
i cnt even get the key angle right :O

 

[Thought blocker]

r u sure the answers r correct
i cnt even get the key angle right :O

I just get 70
Haya Ahmed are answers for C correct?