1/seca-tana+1/seca+tana=2seca
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hope it helps............
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Step-by-step explanation:
1) 1/seca -tana+1/seca+tana
cross multiply
2) (seca-tana)+(seca+tana)/(seca+tana)(seca-tana)
seca-tana+seca+tana/sec2a-tan2a... numerator -opening brackets,denominator-indenitiy (a-b)(a+b)=a2-b2
3)2seca/1=2seca
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