2

June 2022 1 5 Report

Вычислите sin(30°+a), если cos a =-0,6. И пи/2<а<пи

Answers & Comments

nKrynka Решение
sin(30° + a) = sin30°cosa + cos30°sina = (1/2)*cosa + (√3/2)sina
sina = √(1 - cos²a) = √( 1 - (- 0,6)²) = √(1 - 0,36) = √0,64 = 0,8
(1/2)*(- 0,6) + (√3/2)*(0,8) = - 3/10 + 2√3/5 ≈ 0,392
(√3 ≈ 1,73)

17 votes Thanks 31

lestnica soedinyaet tochki a i b vysota kazhdoj stupeni ravna 105 sm a dlina rav

Answer

xOCHOBAx July 2022 | 0 Ответы

v magazine stroitel delayut skidku 25 na pokupku ot 10 meshkov cementa meshok03781559ecdd01ddb6ef118a7030ee4d 55250

Answer

Answers & Comments

2 x y pri x2 y4

uprostite vyrazhenie cos 2a sin a b cos b a sin2a

reshite pozhalujsta 10sin2xcos2x 30

reshite uravnenie pozhalujstae0466cfde4c91b33e9aabed6bf5b0c88 61468

reshite uravnenie pozhalujstaf0d1f9326c473c3244ea4a0d3f0c01c8 26585

pervaya stroka matricy a array 12 13 of integer imeet znacheniya 1 2

elementy massiv1314 of integer poluchili znacheniya posle vypolneniya sledushe

pervye 3 chlena geometricheskoj progressii 18 70 300 najdite 4 chlen etoj progr

lestnica soedinyaet tochki a i b vysota kazhdoj stupeni ravna 105 sm a dlina rav

v magazine stroitel delayut skidku 25 na pokupku ot 10 meshkov cementa meshok03781559ecdd01ddb6ef118a7030ee4d 55250

рекомендуемые вопросы

Helpful Links

Helpful Social