Prove that 1 + tano tan = sec 0 2
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LHS =1+cotA−cosecA=1+
sinA
cosA
−
sinA
1
=1+tanA+secA=1+
cosA
sinA
+
cosA
1
=
cosA
(sinA+cosA+1)
+cotA−cosecA)(1+tanA+secA+cotA−cosecA)(1+tanA+secA sin A cos A−1)(sinA+cosA+1)
=
sinAcosA
(sinA+cosA)
2
−1
=
sinAcosA
1+2sinAcosA−1
=2=RHS
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