Find the value of the : `sin^2 (pi/6) + cos^2 (pi/3) - tan^2 (pi/4)`

Find the value of the :cos^(2)((pi)/(6))+cos ec(5(pi)/(6))+3tan^(2)((pi)/(6))

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

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

If tan x=(-3)/(4) " and" (3pi)/(2) lt x lt 2 pi find the value of "(i) " sin 2x , "(ii) " cos 2x , "(iii) " tan 2x

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

Find the value of (sin^(4)45+cos^(2)45-tan^(2)45)/(cos ec((pi)/(4))+sec((pi)/(4))-cot((pi)/(6)))

Find the value of cos^(-1) ( cos . (2pi)/3) + sin^(-1) ( sin . (2pi)/3) .

The value of 2sin^(2)((pi)/(3))-cos^(2)((pi)/(6))+tan^(2)(pi/6) is equal to ....

Find the value of the following :- {:((a)sin((pi)/(6)),(b)cos ((pi)/(4))), ((c)tan((pi)/(3)),(d)cos ((pi)/(2))), ((e)cot ((3pi)/(4)),(f)sin((5pi)/(6))),((g)sin pi,(h)cos pi),((i)sin((pi)/(2)),(j)sin((3pi)/(2))),((k)cos((3pi)/(2)),):}