14 Apr Melinda and Paula shovel driveways and sidewalks in the winter as a way to earn extra money. Together, they shoveled 450 square feet of sidewa …

Find an answer to your question Cos pi/7. cos 2pi/7. cos 4pi/7 = ? AkshatNasa293 AkshatNasa293 ...

De Moivre's formula tells us that: #(cos theta + i sin theta)^n = cos n theta + i sin n theta# So we find: #(2(cos(pi/3)+i sin(pi/3)))^4 = 2^4(cos((4pi)/3) + i sin ...

Jun 12, 2018 · We have to prove , #sin((5pi)/18)+cos((4pi)/9)=cos(pi/9)# We take, #LHS=sin((5pi)/18)+cos((4pi)/9)# #color(white)(LHS)=cos(pi/2-(5pi)/18)+cos((4pi)/9)#

Dec 24, 2018 · Find an answer to your question Prove that: Cos x + Cos(x+ 2pi/3) + Cos (x + 4pi/3) =0

May 22, 2017 · #cos(-9/4pi) = cos((-2pi)-1/4pi)# #=cos(-2pi)cos(1/4pi) + sin(-2pi)sin(1/4pi)# #=(1)(sqrt2/2) + (0)(sqrt2/2)# ...

Apr 1, 2016 · #2 cos A cos B=cos (A+B) + cos (A-B) # # cos A cos B=1/2 (cos (A+B) + cos (A-B)) # #A=(4pi)/3, B = pi/6# # cos ((4pi)/3) cos (pi/6)=1/2 (cos ((4pi)/3+pi/6) + cos ...

Mar 11, 2017 · How do you find the exact value of the expression #sin(pi/12)cos(pi/4)+cos(pi/12)sin(pi/4)#?

Mar 26, 2019 · Prove that cos pi/65.cos 2pi/65.cos 4pi/65.cos 8pi/65.cos 16pi/65.cos 32 pi/65 = 1/64? - 9017381 deeptisomasekar3933 deeptisomasekar3933 26.03.2019

Jul 25, 2017 · #16cos(pi/15)cos((2pi)/5)cos((4pi)/15)cos((8pi)/15)# = #8xx2sin(pi/15)cos(pi/15)xxcos((2pi)/15)cos((4pi)/15)cos((8pi)/15)xx1/sin(pi/15)#