(2 Sintheata-1)(2Sintheata+1)=0 find the value of theata whether it is cos 30 or sin 60
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Answer:
Step-by-step explanation:
(2sinΦ-1)(2sinΦ+1)=0
(2sinΦ)2-(1)2=0
4sin2Φ-1=0
4sin2Φ=1
Sin2Φ=1/4
SinΦ√1/4
SinΦ=1/2
Φ=30°
rameshbs1:
But it can be sin 60 also no if we take sin2A as 1-cos2A
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