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Sin squared-2sincos+cos square+sin squared+2sincos+cos squared.

There is a formula wherein
Sin squared+cos squared=1

Cancel the 2sincos for they are like terms and like terms need to add. Then substitute
Sin squared-cos squared+1=?

By the formula earlier, transposing the cos squared would result to:
Sin squared=1-cos squared

Sin squared+Sin squared=2sinsquared

Hope it helps =)
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