plzz solve step by step
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Answer:
sec²theta - tan² theta/4(sin²50 + cos²50) - 2(1/3) cosec²38 sin²38/ 3(sec²20- tan²20)
= 1/4 - 2/3 x 1/3
= 1/4 - 2/9
=9-8/9
= 1/9
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