(x-a)(x-b)(x-c)..................(x-y)(x-y) Multiply this if you have guts
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(x-a)(x-b)(x-c)..................(x-y)(x-y) Multiply this if you have guts
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Answer:
Given: tanA= cotB
To prove: (a+b)= 90°
Proof-
tanA= cotB
tanA= tan(90°-B). [ cotB= tan(90°-B)]
A= 90°-B.
[By eliminating tan from both sides]
Hence, A+B= 90° Proved
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