show that cos∧4∅-sin∧4∅=2cos∧2∅-1
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here is your ans my frd
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cos⁴ - sin⁴ = 2 cos² -1
change sin into cos
Cos⁴ - (sin²)²
Cos⁴ - (1- Cos²)²
Cos⁴ -1 -cos⁴ +2cos²
Cos⁴ - Cos⁴ + 2Cos² -1
2cos²-1
proved
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