(x)quad cos^(2)0^(@)+tan^(2)(pi)/(4)+sin^(2)(pi)/(4)" जहाँ,"pi=180^(@)

cos ^ (2) (pi / 4 + x) -sin ^ (2) (pi / 4-x)

cos^(2)""((pi)/(4) +x ) - sin^(2) ""((pi)/4- x ) =

Prove that (a) sin^(2)(pi/6) + cos^(2)( pi/3) - tan^(2)(pi/4) = -1/2 (b) sin((8pi)/3) cos((23pi)/6) + cos((13pi)/3) sin((35pi)/6) = 1/2

Evaluate cos^2((pi)/(3))+sin^2((pi)/6)-tan^2((pi)/4)

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) "cos " .(pi)/(6) =(7)/(4) (iii) " 4sin " (pi)/(6) " sin"^(2) (pi)/(3) + 3 " cos " .(pi)/(3) " tan ".(pi)/(4) = " cosec"^(2).(pi)/(2)=4

"sin^(2)(pi)/(6)+cos^(2)(pi)/(3)-tan^(2)(pi)/(4)=-(1)/(2)"

sin^(2)""(2pi)/(3)+ cos^(2)""(5pi)/6-tan^(2)""(3pi)/4=

The value of cos^(2)0+sin^(2)((pi)/(6))+tan^(2)((pi)/(3))+cosec^(2)((pi)/(2)) is