SA3 marksYear: 2023HardCBSE Class 10
trigonometryidentitiesproof
Question
Prove that: tanθ−secθ+1tanθ+secθ−1=cosθ1+sinθ
Solution
1
LHS =tanθ−secθ+1(tanθ+secθ)−(sec2θ−tan2θ)
+1 mark2
=tanθ−secθ+1(tanθ+secθ)(1−secθ+tanθ)
+1 mark3
=tanθ+secθ
=cosθ1+sinθ= RHS
+1 mark