find the value of cos⁴A - sin⁴A = ?
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[tex]\huge\tt ☃{SOLUTION:}[/tex]
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cos^4A = (cos^2A)^2
sin^4A = (sin^2A)^2
cos^4A - sin^4A
= (cos^2A)^2 - (sin^2A)^2
= (cos^2A + sin^2A) (cos^2A - sin^2A)
= (1) × [cos^A - (1-cos^A)]
= cos^A - 1 + cos^A
= 2cos^A - 1
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[tex]\bold{Thank ~you~:)}[/tex]
Verified answer
ans::::: =
2cos²A-1
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