Предмет: Алгебра, автор: BobSFeel

Решите уравнение:
3√3cos(3π/2+x)-3=2sin^2x

Ответы

Автор ответа: ник3709

3кор3cos(3п/2+x)-3=2sin^2x;
3кор3sinx-3=2sin^2x;
2sin^2x-3 кор3sinx+3=0;
sinx=t;
2t^2-3кор3t+3=0;
D=(-3кор3)^2-2×4×3=27-24=3;

t=(3 кор 3-кор3)/4= кор3/2;
t=(3корень из 3+кор3)/4=корень из 3>1;

sinx=корень из 3/2;

х=(-1)^n п/3+пn, n€z.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: darinakuanyskalieva1

Task4 Bats are the only 1) reptiles/mammals on Earth that can truly fly. They have very thin 2) fins/wings and their bodies are covered in 3) fur/ feathers to keep them warm. They have tiny sharp teeth and small eyes. Some bats can't see well, so they rely on their excellent hearing and smell to find their way around. Bees are insects and so they have số 4) arms/legs. They also have two pairs of wings to fly and a peir of 5) antennae/claws on their heed to feel and smell. They have very long tongues so that they can reach the nectar from inside flowers. Female bees have a poisanous 6) sting/heak to defend themselves. Dolphins live in water, but they are mammals, so they need to breathe air, They do this through a 7) shell/blowhole near the top of their heads. They can hear extremely well from the ear &8) openings/gills on the sides of their heads. Dolphins haven't got limbs, but they have got 99 fins/wings. The top one keeps them stable, and the bottom ones steer them in the right direction. The up-and-down motion of their 10) tails/horns makes them move through the water. 5 a) Read the definitions. reptiles: cold-blooded animals wwhich have scaly skin and lay eggs mammals: warm-blooded animals that give birth to live babies and feed their young on milk amphibians: animals that live both on land and in water fish: cold-blooded creatures that live in water and usually have gills and fins birds: creatures insects: small animals with feathers and wings that have six legs and most of them have wings rodents: small mammals with sharp front teeth b) Which type of animal are each of the animals below? Decide in pairs. * mouse - fly - monkey - whale • beetle • frog - seal * eagle • squirrel - butterfly • parrot • cracodile • toad • tuna jaguar iguana • salmon• kangaroo • chameleon • bear

5 лет назад

Предмет: Геометрия, автор: freddeartem2016

Найти синус, косинус и тангенс острых углов A И B прямоугольного треугольника abc, если Ab=13, Ac=12см
Б)найти синус и тангенс угла A, если его косинус 5/13

5 лет назад

Предмет: Геометрия, автор: arunaarmankyzy69

ПОЖАЛУЙСТА ПОМОГИТЕ СОЧ. разделите угол на четыре равные части. ПОЖАЛУЙСТА НАЧЕРТИТЕ В ТЕТРАДИ А ТО НЕ ПОНЯТНО!!!!!!!!!!!!!!!!!!

5 лет назад