If Siin theta + sin square theta = 1 then show that cos square theta + cos 4 theta = 1
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Step-by-step explanation:
SinO + Sin²O = 1
SinO = Cos²O
Cos²O + Cos⁴O
Cos²O + (Cos²O)²
Cos²O + Sin²O = 1
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It is a correct answer.
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