sin⁸ø-cos⁸ø/1-2sinøcosø=sin²ø-cos²ø
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hope it will work for you ✌️
Step-by-step explanation:
cos⁴ø - sin⁴ø = 1/2
=>( cos²ø)² - (sin²ø)² = 1/2
=>(cos²ø - sin²ø)(cos²ø + sin²ø)=1/2
=>( cos²ø - sin²ø )×1 = 1/2
=> cos²ø - sin²ø = 1/2
=> cos2ø = 1/2
=> cos 2ø = cos 60°
=> 2ø = 60°
=> ø = 30°
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