Question

despejar 1 + cos(x)= 2sen²(x)?

Answer 1

x=((cos_rad(((pi*x)/180))+1)/(2*sen2))

Answer 2

1 +cosx = 2sen²x  como  sen²x = 1 -cos²x remplazamos
1 +cosx = 2( 1-cos²x)
1 +cosx = 2 -2cos²x
1 +cosx -2 +2cos²x = 0
2cos²x +cosx -1 = 0

cosx =[ -b + o - √(b² -4ac)] /2a

cosx =[ -1+o-√(1² -4(2)(-1)] /2*2

cosx = [ -1 + o - √1+8]/4
cosx = [-1 +o-√9]/4
cosx = (-1 +o- 3)/4
cosx = (-1+3)/4
cosx = 2/4
cosx = 1/2
cox = 0,5
x = arc cos0,5
x =60°

cos x =( -1-3)/4
cosx = -4/4
cosx = -1
x = arc cos -1
x =180°