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= (2√3/√5-√2) × (√3/√5+√2)
=2×3/5+√10-√10-2
=6/5-2
=6/3
=2
b. p^2q^2 = (√3/√5-√2)^2(√3/√5+√2)^2
=(3/5-√10-√10+2)(3/5+√10+√10+2)
=(3/5-2√10+2)(3/5+2√10+2)
=9/25+10√10+10-10√10-4×10-4√10+10+4√10+4
=9/25+10√10-10√10-4√10+4√10+10-40+10+4
=9/25+10-40+10+4
=9/49-40
=9/9
=1