Question

10. Angle ECF = 3 Angle ACE and angle ADB = 72º. Find the
value of x.
A
x x
E
72°
D
B.
с
TI

Answer 1

Answer:

1+cos(β)

−

1+cos(β)

sin(β)

=2cot(β)

sin(β)(1+cos(β))

(1+cos(β))

2

−sin

2

(β)

sin(β)(1+cos(β))

1+cos(β)

2

+2cos(β)−sin

2

(β)

sin(β)(1+cos(β))

cos

2

(β)+cos

2

(β)+2cos(β)

sin(β)(1+cos(β))

2cos

2

(β)+2cos(β)

sin(β)(1+cos(β))

2cos(β)(cos(β)+1)

sin(β)

2cos(β)

2cot(β)