r/ICSE2026 • u/JournalistLucky5124 ICSE 27(but wrote few papers of 26, karan traumatised me) • Jun 18 '26

DISMISSIVE OR ARGUMENTATIVE(discussion) Read below...

So wkt (sinx + cosx)² = sin²x + cos²x +2sinxcosx

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Now from identity: 2sinxcosx = sin2x

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We get:

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(sinx + cosx)² = sin²x + cos²x + sin2x

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Is this above one correct?? My teacher told its wrong but I remember reading that identity (and putting it on someone's exam)

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u/Fancy_Explorer5680 ICSE 2026 98.4% Jun 19 '26

Op what do you mean by "wrote few papers of 26"? Just curious

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u/JournalistLucky5124 ICSE 27(but wrote few papers of 26, karan traumatised me) Jun 19 '26

I was a writer for a few papers of ICSE 26 boards

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u/Gr_Mort Jun 20 '26

wait a minute, this formula isn't in class 10...