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2014-05-28T16:47:37+08:00

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2sin^2 225 - tan135
2(-sqrt(2)/2) - (-sqrt(2)/2)
-2sqrt(2)/2 + sqrt(2)/2

=-sqrt(2) /2

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2014-05-28T16:54:46+08:00

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The reference angle of 225º is 45º. Since it is in QIII, sin 225º = - \frac{ \sqrt{2} }{2} .

The reference angle of 135º is also 45º. Since it is in QII, tan 135º = -1

Substituting those values, we have

2 (- \frac{ \sqrt{2} }{2} )² - (-1)

= 2 (2/4) + 1 = 2
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