Question

Please give me the ans..

Answer 1

Because 1+Tan²Ф = Sec²Ф,

  L.H.S ≡ (Sec²Ф-1)² +Sec²Ф-1

            ≡ Sec4Ф - 2Sec²Ф + 1 + Sec²Ф- 1

            ≡ Sec4Ф - Sec²Ф ≡ R.H.S

Hence,proved.

Note that Sec4Ф is sec Ф to the power of 4.There's no way to indicate that in standard way.

Answer 2

ⓗⓔⓨ ⓜⓐⓣⓔ ! ___________________________________________________________________________

Proved||| Above . Refer to attachment

----HLP
---THANXXX...