If x2 = sin230° + 4 cot245° – sec260°, then the value

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x² = sin²30° + 4 cot²45° – sec²60°

=		1		²	+ 4(1)² – (2)²
		2

=	1	+ 4 – 4 =	1
	4		4

∴ x =	1
	2

−	1
	2