___
\/ 2 *sin(2*a)
--------------
2
$$\frac{\sqrt{2} \sin{\left(2 a \right)}}{2}$$
Подстановка условия
[src]
cos(5*pi/8 + a)^2 - sin(15*pi/8 + a)^2 при a = 1/4
2/5*pi \ 2/15*pi \
cos |---- + a| - sin |----- + a|
\ 8 / \ 8 /
$$- \sin^{2}{\left(a + \frac{15 \pi}{8} \right)} + \cos^{2}{\left(a + \frac{5 \pi}{8} \right)}$$
___
\/ 2 *sin(2*a)
--------------
2
$$\frac{\sqrt{2} \sin{\left(2 a \right)}}{2}$$
$$a = \frac{1}{4}$$
___
\/ 2 *sin(2*(1/4))
------------------
2
$$\frac{\sqrt{2} \sin{\left(2 (1/4) \right)}}{2}$$
___
\/ 2 *sin(1/2)
--------------
2
$$\frac{\sqrt{2} \sin{\left(\frac{1}{2} \right)}}{2}$$
/ / pi\ / 3*pi\\ / / 3*pi\ / pi\\
-|- sin|a + --| + cos|a + ----||*|cos|a + ----| + sin|a + --||
\ \ 8 / \ 8 // \ \ 8 / \ 8 //
$$- \left(- \sin{\left(a + \frac{\pi}{8} \right)} + \cos{\left(a + \frac{3 \pi}{8} \right)}\right) \left(\sin{\left(a + \frac{\pi}{8} \right)} + \cos{\left(a + \frac{3 \pi}{8} \right)}\right)$$
-(-sin(a + pi/8) + cos(a + 3*pi/8))*(cos(a + 3*pi/8) + sin(a + pi/8))
cos(5*pi/8 + a)^2 - sin(15*pi/8 + a)^2
cos(5*pi/8 + a)^2 - sin(15*pi/8 + a)^2
2/ pi\ 2/ 3*pi\
sin |a + --| - cos |a + ----|
\ 8 / \ 8 /
$$\sin^{2}{\left(a + \frac{\pi}{8} \right)} - \cos^{2}{\left(a + \frac{3 \pi}{8} \right)}$$
2 2
/ / 5*pi\ / 5*pi\\ / / 15*pi\ / 15*pi\\
| I*|a + ----| I*|-a - ----|| | I*|-a - -----| I*|a + -----||
| \ 8 / \ 8 /| | \ 8 / \ 8 /|
|e e | \- e + e /
|------------- + --------------| + -------------------------------------
\ 2 2 / 4
$$\frac{\left(- e^{i \left(- a - \frac{15 \pi}{8}\right)} + e^{i \left(a + \frac{15 \pi}{8}\right)}\right)^{2}}{4} + \left(\frac{e^{i \left(- a - \frac{5 \pi}{8}\right)}}{2} + \frac{e^{i \left(a + \frac{5 \pi}{8}\right)}}{2}\right)^{2}$$
(exp(i*(a + 5*pi/8))/2 + exp(i*(-a - 5*pi/8))/2)^2 + (-exp(i*(-a - 15*pi/8)) + exp(i*(a + 15*pi/8)))^2/4
Объединение рациональных выражений
[src]
2/5*pi + 8*a\ 2/8*a + 15*pi\
cos |----------| - sin |-----------|
\ 8 / \ 8 /
$$- \sin^{2}{\left(\frac{8 a + 15 \pi}{8} \right)} + \cos^{2}{\left(\frac{8 a + 5 \pi}{8} \right)}$$
cos((5*pi + 8*a)/8)^2 - sin((8*a + 15*pi)/8)^2
/ pi\ / pi\
sin|2*a + --| cos|2*a + --|
\ 4 / \ 4 /
------------- - -------------
2 2
$$\frac{\sin{\left(2 a + \frac{\pi}{4} \right)}}{2} - \frac{\cos{\left(2 a + \frac{\pi}{4} \right)}}{2}$$
sin(2*a + pi/4)/2 - cos(2*a + pi/4)/2
Рациональный знаменатель
[src]
2/ pi\ 2/ 3*pi\
sin |a + --| - cos |a + ----|
\ 8 / \ 8 /
$$\sin^{2}{\left(a + \frac{\pi}{8} \right)} - \cos^{2}{\left(a + \frac{3 \pi}{8} \right)}$$
sin(a + pi/8)^2 - cos(a + 3*pi/8)^2
___________ ___________
/ ___ / ___
/ 1 \/ 2 / 1 \/ 2
4* / - - ----- * / - + ----- *cos(a)*sin(a)
\/ 2 4 \/ 2 4
$$4 \sqrt{- \frac{\sqrt{2}}{4} + \frac{1}{2}} \sqrt{\frac{\sqrt{2}}{4} + \frac{1}{2}} \sin{\left(a \right)} \cos{\left(a \right)}$$
2 2
/ ___________ ___________ \ / ___________ ___________ \
| / ___ / ___ | | / ___ / ___ |
| / 1 \/ 2 / 1 \/ 2 | | / 1 \/ 2 / 1 \/ 2 |
|- / - - ----- *cos(a) - / - + ----- *sin(a)| - | / - + ----- *sin(a) - / - - ----- *cos(a)|
\ \/ 2 4 \/ 2 4 / \\/ 2 4 \/ 2 4 /
$$\left(- \sqrt{\frac{\sqrt{2}}{4} + \frac{1}{2}} \sin{\left(a \right)} - \sqrt{- \frac{\sqrt{2}}{4} + \frac{1}{2}} \cos{\left(a \right)}\right)^{2} - \left(\sqrt{\frac{\sqrt{2}}{4} + \frac{1}{2}} \sin{\left(a \right)} - \sqrt{- \frac{\sqrt{2}}{4} + \frac{1}{2}} \cos{\left(a \right)}\right)^{2}$$
(-sqrt(1/2 - sqrt(2)/4)*cos(a) - sqrt(1/2 + sqrt(2)/4)*sin(a))^2 - (sqrt(1/2 + sqrt(2)/4)*sin(a) - sqrt(1/2 - sqrt(2)/4)*cos(a))^2
2/ pi\ 2/ 3*pi\
sin |a + --| - cos |a + ----|
\ 8 / \ 8 /
$$\sin^{2}{\left(a + \frac{\pi}{8} \right)} - \cos^{2}{\left(a + \frac{3 \pi}{8} \right)}$$
sin(a + pi/8)^2 - cos(a + 3*pi/8)^2