exam Maths Puzzle Numerical Ability

If,
sec@=sec$sec*+tan$tan*
Then Prove That:
sec$=sec*sec@+tan*tan@
sec*=sec@sec$+tan@tan$

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exam Other Question

(–7 sqrt sign 11 - sqrt sign7)(sqrt sign 7 – 10 sqrt sign 11)

simplify
4a*8 - 20a*6 + 8a*4