sin A-cosA+1/sinA +cosA -1=1/secA - tan A
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Step-by-step explanation:
LHS:
devide cosA in both numerator & denimunator
tanA-1+secA/tanA+1-secA
={(tanA+secA)-1}(tanA-secA)/{(tanA-secA)+1}(tanA-secA)
=(tan²A-sec²A)-(tanA-secA)/(tanA-secA+1)(tanA-secA)
=-1-tanA+secA/(tanA-secA+1)(tanA-secA)
=-1-(tanA-secA)/(tanA-secA+1)(tanA-secA)
=-1/tanA-secA+1
=1/secA-tanA
RHS
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