7. (cosec A - sin A) (sec A-cos A) (tan A + cot A)=1
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(cosec A-sin A)(sec A-cos A)(tan A-cotA)=1
L.H.S=(cosec A-sin A)(sec A-cos A)(tan A+cotA)
L.H.S=(1/sin A-sinA)(1/cos A-cos A)(1/cot A+cot A)-[since cosec A=1/sin A, sec A=1/cos A, tanA=1/cotA]
L.H.S.=1x1x1
L.H.S.=1
therefore L.H.S=R.H.S.
-Hence proved✅️✅️✌️
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