1.
Sol:
2. For any , prove that cosh4x-sinh4x = cosh (2x).
Sol:
3. Prove that for x 0.
Sol:
4. Prove that (coshx-sinhx)n = cosh(nx)-sinh(nx), for any n
Sol:
5. If and if cosθ > 0, then prove that coshu = secθ.
Sol:
Writer - Dr. P. Bal Reddy