Question

sin²2c + sin 2 60°=1
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Answer 1

Step-by-step explanation:

Your answer is sin^2 45 + cos^2 45

hope it is correct u can refer the attachment....

:-)

Answer 2

Answer:

Step-by-step explanation:

ANSWER

Given:

⇒sin2A+sin2B+sin2C

⇒A+B+C=180

Formula:  

1]sinC+sinD=2sin  

2

C+D

​  

cos  

2

C−D

​  

 and

2]sin2A=2sinA.cosA

L.H.S.=sin2A+sin2B+sin2C

 

=2sinAcosA+2sin(B+C)cos(B−C)

=2sinAcosA+2sinAcos(B−C)

=2sinA[cosA+cos(B−C)]

=2sinA[cos(B−C)−cos(B+C)]

[∵cosA=−cos(B+C)]

=2sinA⋅2sinBsinC

=4sinAsinBsinC.