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(x² - y²)²
= ((tan 2α - sin 2α)² - (tan 2α + sin 2α)²)²
= ((tan² 2α - 2tan 2α.sin 2α + sin² 2α) - (tan² 2α + 2tan 2α.sin 2α + sin² 2α))²
= (tan² 2α - 2tan 2α.sin 2α + sin² 2α - tan² 2α - 2tan 2α.sin 2α - sin² 2α)²
= ( - 2tan 2α.sin 2α - 2tan 2α.sin 2α)²
= (4tan 2α.sin 2α)²
= 16.tan 2α.sin 2α
= 16xy