if sin 2A = cos 72 then then value of A
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Answered by
1
Answer:
#follow for 50 points
sin 2A = cos 72
sin 2A = sin 18
2A = 18
∴ A = 9
Answered by
1
Answer:
sin 2A=cos(90-2A)
Cos(90-2A)=Cos(72)
90-2A=72
2A=18
A=9
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