CosecA=(m^2-n^2)÷(m^2+n^2)
then prove m² +n2
- 2mn Sec A
=​

sine

step-by-step explanation:

kjnsk nidn t

dfj dt

step-by-step explanation:

vjnijernv

4y - 6 + y^2 - 9 = y^2 + 4y - 15

y^2 term

terms

- terms

total of 3 terms when simplified

step-by-step explanation:

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: