`cos((11 pi)/(6))=`

Prove that (sin(-(11pi)/(3))tan((35pi)/(6))sec(-(7pi)/(3)))/(cos((5pi)/(4))cosc((7pi)/(4))cos((17pi)/(6)))= (2)/(sqrt(3))

sin((7 pi)/(4))*cos((7 pi)/(6))*tan((3 pi)/(4))*cot((11 pi)/(6)) is equal to

The value of (1+cos((pi)/(6)))(1+cos((pi)/(3)))(1+cos((2 pi)/(3)))(1+cos((7 pi)/(6)))=

Approximate cos((11pi)/(36)) using differentials.

Approximate cos((11pi)/(36)) using differentials.

cos ((5pi)/(4)) - sin ((5pi)/(4)) + tan((11pi)/(4)) - cot((11pi)/(4))=

If f (x) = sqrt(cos ec ^(2) x - 2 sin x cos x - (1)/(tan ^(2) x )) x in ((7pi)/(4), 2pi ) then f' ((11 pi)/(6))=

If f (x) = sqrt(cos ec ^(2) x - 2 sin x cos x - (1)/(tan ^(2) x )) x in ((7pi)/(4), 2pi ) then f' ((11 pi)/(6))=

The principal value of cos^(-1)("cos"(11pi)/(6)) is -

Write the principal value of "cos"^(-1)("cos"(11pi)/(6)) .