![Prove that (i) " tan"^(2) .(pi)/(3) + 2cos^(2) .(pi)/(4)+ 3 sec^(2).(pi)/(6)+ 4 cos^(2).(pi)/(2)=8 (ii) " sin ".(pi)/(6) " cos 0 + sin ".(pi)/(4) " cos " .(pi)(4) + " sin " .(pi)/(3) " Prove that (i) " tan"^(2) .(pi)/(3) + 2cos^(2) .(pi)/(4)+ 3 sec^(2).(pi)/(6)+ 4 cos^(2).(pi)/(2)=8 (ii) " sin ".(pi)/(6) " cos 0 + sin ".(pi)/(4) " cos " .(pi)(4) + " sin " .(pi)/(3) "](https://d10lpgp6xz60nq.cloudfront.net/ss/web/901010.jpg)
Prove that (i) " tan"^(2) .(pi)/(3) + 2cos^(2) .(pi)/(4)+ 3 sec^(2).(pi)/(6)+ 4 cos^(2).(pi)/(2)=8 (ii) " sin ".(pi)/(6) " cos 0 + sin ".(pi)/(4) " cos " .(pi)(4) + " sin " .(pi)/(3) "
![5. if the expression `cos^2(pi/11)+cos^2((2pi)/11)+cos^2((3pi)/11)+cos^2(( 4pi)/11)+cos^2((5pi)/... - YouTube 5. if the expression `cos^2(pi/11)+cos^2((2pi)/11)+cos^2((3pi)/11)+cos^2(( 4pi)/11)+cos^2((5pi)/... - YouTube](https://i.ytimg.com/vi/W--ncDCCv-0/maxresdefault.jpg)
5. if the expression `cos^2(pi/11)+cos^2((2pi)/11)+cos^2((3pi)/11)+cos^2(( 4pi)/11)+cos^2((5pi)/... - YouTube
![Find the value of the following :- `{:((a)sin((pi)/(6)),(b)cos ((pi)/(4))), ((c)tan((pi)/(3)), - YouTube Find the value of the following :- `{:((a)sin((pi)/(6)),(b)cos ((pi)/(4))), ((c)tan((pi)/(3)), - YouTube](https://i.ytimg.com/vi/vAY8P1rGi_o/maxresdefault.jpg?sqp=-oaymwEmCIAKENAF8quKqQMa8AEB-AH-CYAC0AWKAgwIABABGGIgYihiMA8=&rs=AOn4CLBNTpY19z8l8NPrxC4ThUFKKh5mbw)
Find the value of the following :- `{:((a)sin((pi)/(6)),(b)cos ((pi)/(4))), ((c)tan((pi)/(3)), - YouTube
![let `x_1=cos(pi/11)cos((2pi)/11)cos((3pi)/11)cos((4pi)/11)cos((5pi)/11)` and `x_2=cos(pi/11)+co... - YouTube let `x_1=cos(pi/11)cos((2pi)/11)cos((3pi)/11)cos((4pi)/11)cos((5pi)/11)` and `x_2=cos(pi/11)+co... - YouTube](https://i.ytimg.com/vi/X1wLA96ExTA/maxresdefault.jpg)
let `x_1=cos(pi/11)cos((2pi)/11)cos((3pi)/11)cos((4pi)/11)cos((5pi)/11)` and `x_2=cos(pi/11)+co... - YouTube
![For which of the quadrant angles 0, pi/2, pi , and 3pi/2 is the sine function equal to 0? | Homework.Study.com For which of the quadrant angles 0, pi/2, pi , and 3pi/2 is the sine function equal to 0? | Homework.Study.com](https://homework.study.com/cimages/multimages/16/screen_shot_2022-09-06_at_11.33.19_pm4725595962387773634.png)
For which of the quadrant angles 0, pi/2, pi , and 3pi/2 is the sine function equal to 0? | Homework.Study.com
![let x1=cos(pi/11)cos((2pi)/11)cos((3pi)/11)cos((4pi)/11)cos((5pi)/11) and x2=cos(pi/11)+cos(2pi/11)+cos(3pi/11)+cos(4pi/11)+cos(5pi/11) then show that x1.x2=1/64(cosec(pi/22)-1) let x1=cos(pi/11)cos((2pi)/11)cos((3pi)/11)cos((4pi)/11)cos((5pi)/11) and x2=cos(pi/11)+cos(2pi/11)+cos(3pi/11)+cos(4pi/11)+cos(5pi/11) then show that x1.x2=1/64(cosec(pi/22)-1)](https://d10lpgp6xz60nq.cloudfront.net/q-thumbnail/35469.png)