2 tan^2a-2sec^2a-5cot^2a+5cosec^2a=
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Answer:ans=3
Step-by-step explanation 2 tan^2a-2sec^2a-5cot^2a+5cosec^2a
taking -2 and +5 common
=-2[sec^2a-tan^2a]+5[cosec^2a-cot^2a]
=-2[1]+5[1]
=-2+5
=3
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