AP EAMCET · Maths · Trigonometric Ratios & Identities
If , then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
Given: 4+6e2x+1tanhx=11coshx+11sinhx ⇒4+6e2x+1ex-e-xex+e-x=11ex+e-x2+11ex-e-x2 ⇒4+6e2x+1e2x-1e2x+1=11ex ⇒4+6e2x-1=11ex ⇒6e2x-11ex-2=0 Put ex=t; t>0 ⇒6t2-11t-2=0 ⇒t=11±121+4812 ⇒t=2, -16 Since, t>0, so t=2…
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