Questions and answers by

Evelina

Questions (12)

How many solutions equation x^4 + 2x^2 - 15 = 0 has?
1. 1 answer
2. 402 views
If √8-a + √5+a = 5, then √(8-a)(5+a) = ...Please help me solve this.
1. 2 answers
2. 307 views
I have codone AUG.Which one of amino acids will be involved in protein making, if nucleotide with adenine (A) will be changed to
1. 0 answers
2. 429 views
V(CH3OH)= 2 litresρ(CH3OH) = 0,80 g/ml v(O2) - ? (How much O2 is it needed to burn with 2 litres of CH3OH?)
1. 0 answers
2. 409 views
V(CH3OH)= 2 litresρ(CH3OH) = 0,80 g/ml v(O2) - ? (How much O2 is it needed to burn with 2 litres of CH3OH?)
1. 1 answer
2. 339 views
If (cosa-sina)/sina = 2 , then what is tga = ?
1. 1 answer
2. 576 views
I need to prove parallelogram law using the law of cosines.2AB^2 + 2BC^2 = AC^2 + BD^2 Please, help me to do this.
1. 4 answers
2. 464 views
How to prove the theorem of sines, using S=(a*b/2) * sin γ ?
1. 1 answer
2. 362 views
I need to count this:a) 1-tg^2a/1+ctg^2a, when sina =2/3 b) 1-tg^2a/1-ctg^2a, when cosa= -1/3 c) tga * cos^2a, when sina +
1. 1 answer
2. 594 views
I need to prove equality.a) (sina + cosa)^2 -1 / ctga - sinacosa = 2tg^2a b) (sin^2x/sinx-cosx) - (sinx+cosx/tg^2x+1) = sinx +
1. 4 answers
2. 937 views
How to do this one?(sina/1-cosa) + (1-cosa/sina) = Also, wanted to ask if I did another one right: 1 - sin^2a + tg^2a * cos^2a =
1. 2 answers
2. 479 views
Please help me how to do this:1) 1 + sina*cosa / (cosa + sina)^2 = 2) sina + cosa / 1- 2sin^2a =
1. 2 answers
2. 448 views