Using the half angle formula, what is the exact value of cos11pi/12?

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Step-by-step explanation:

Using the half angle formula

• cos() =

here = , hence

x =

and cos () = cos() =

cos ()

= -

= - = -

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing im pretty sure that is the right answer

step-by-step explanation: