# Question no 26's first no please ans

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Answer:

Q) 4sinA sin2A+1- 2 sin 2A=2sinA

a) A =30 A =15

Step-by-step explanation:

4sinA sin2A+1- 2 sin 2A=2sinA

4sinA sin2A+1- 2 sin 2A- 2sinA =0

2sin 2A ( 2sinA-1) -1(2sinA-1) =0

(2sin 2A -1) (2sin A-1) =0

Now solving these equations:

(2sin A-1) =0

sinA = 1/2

Sin A= Sin 30 ( coz sin 30 =1/2)

A = 30

(2sin 2A -1) =0

2sin 2A =1

sin2A = 1/2

sin 2A= sin 30 ( coz sin 30 =1/2)

2A = 30

A = 30/2 =15

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