Срочно помогите. упростите выражение: cos^4 a/2 - sin^4 a/2. Created by DreamL. algebra-ru

2...

Verified answer

$cos^4 \frac{a}{2} -sin^4\frac{a}{2}=(cos^2\frac{a}{2})^2-(sin^2\frac{a}{2})^2=\\\\=(cos^2\frac{a}{2}-sin^2\frac{a}{2})(cos^2\frac{a}{2}+sin^2\frac{a}{2})=\\\\=cos(2*\frac{a}{2})*1=cosa$

3 votes Thanks 2

Юленька194 Если есть вопросы -пишите...

2 votes Thanks 1

Answers & Comments

Verified answer

x+2=0...

dam 35 balov esli reshite 3583

dayu 15 ballov srochno sostavte i tekst ispolzuya eti slovosochetaniya na uroke bo

uprostite vyrazhenie 1a b 2a 2 a a2b b 3 a b 4a 4 a 3a5c00edce12e9a31c5cd7f78f8da676bb 35184

srochno pomogite pozhalujsta ispolzuya tablicu otvette na sleduyushie voprosy 1

pozhalujsta zapolnite tablicu po tekstu dam 50 ballov meni riptesimni aty zhn

chto mozhet pomeshat razvitiyu sobstvennogo biznesa s tochki zreniya obshestva

okruglite desyatichnuyu drob do celyh2 519 40806 656071

na koordinatnoj ploskosti otmette tochki m i n 1m 6 2 n 34 2 m 22 n1

dlina pryamougolnika 14 sm shirina 3 sm razdelite pryamougolnik na 9 ravnyh chast

рекомендуемые вопросы

Helpful Links

Helpful Social