Prove that the equation is an identity.(sec2x - 1) ( sec2x + 1) = tan4x + 2 tan2x
What will be an ideal response?
| (sec2x - 1) ( sec2x + 1) = tan2x ? ( sec2x + 1) | Pythagorean identity |
= tan2x (tan2x + 1) + tan2x Pythagorean identity
= tan4x + tan2x + tan2x
= tan4x + 2 tan2x
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A. 
B. 
C. 
D. 
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A. ?
B. ?
C. ?
D. 
E. ?
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