sec4 0 + tan4 0 = 1 + 2 sec² 0 tan² 0
0 is Thelta
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Step-by-step explanation:
sec⁴A+tan⁴A
=(sec²A)²+(tan²A)²
=(sec²A-tan²A)²+2sec²Atan²A
=1+2sec²Atan²A
replacing theta by A
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