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Step-by-step explanation:
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ok
Step-by-step explanation:
tan(90-@) cot@/cosec^2@ - cos^2@
= cot@ × cot@ / cosec^2 @ - cos^2@
= cot^2@ / cosec^2@ -cos^2 @
= cos^2@/ sin^2@ / cosec^2@ - cos^2@
cos^2@ - cos^2@
= 0
: cosec ^2@ = 1/ sin^2@
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