Kahwai's answer to a's Secondary 3 A Maths Singapore question.
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A^4-B^4 = (A^2 + B^2) ( A^2 - B^2)
A is sinx
B is cosx
A^2 + B^2 = 1
A^2 - B^2 = (A+B) (A-B)
A is sinx
B is cosx
A^2 + B^2 = 1
A^2 - B^2 = (A+B) (A-B)
Date Posted:
3 years ago
thankyou!!
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