Favor ayudar pregunta de Trigonometria : identidades trigonometricasSi : (cos x + sec x) ^ 2 = 10halle el valor de :(√15 - 3)(sen x + csc x) ^ 2 + 4√15?

1) <img src="https://tex.z-dn.net/?f=%5Ccos%20x%20%2B%5Csec%20x%3D%5Cpm%20%5Csqrt%7B10%7D%5C%5C%20%5C%5C%0A%5Ccos%20x%20%2B%5Cdfrac%7B1%7D%7B%5Ccos%20x%7D%3D%5Cpm%20%5Csqrt%7B10%7D%5C%5C%20%5C%5C%20%5C%5C%0A%5Ccos%5E2%20x%2B1%3D%5Cpm%20%5Csqrt%7B10%7D%5Ccos%20x%5C%5C%20%5C%5C%20%0A%5Ccos%5E2%20x%5Cpm%20%5Csqrt%7B10%7D%5Ccos%20x%2B1%3D0%5C%5C%20%5C%5C%20%0A%5Ccos%20x%20%3D%5Cdfrac%7B%5Cpm%5Csqrt%7B10%7D%5Cpm%5Csqrt%7B6%7D%7D%7B2%7D%5C%5C%20%5C%5C%5C%5C%0A%5Ccos%20x%5Cin%5Cleft%5C%7B%5Cdfrac%7B-%5Csqrt%7B10%7D%2B%5Csqrt%7B6%7D%7D%7B2%7D%2C%5Cdfrac%7B%5Csqrt%7B10%7D-%5Csqrt%7B6%7D%7D%7B2%7D%5Cright%5C%7D%0A%5C%5C%20%5C%5C%20%5C%5C%0A%5Ctexttt%7BEntonces%3A%7D%5C%5C%20%5C%5C%0A%5Csin%20x%3D%5Cpm%5Csqrt%7B1-%5Ccos%5E2x%7D%5C%5C%20%5C%5C%0A%5Csin%20x%20%3D%5Cpm%20%5Csqrt%7B1-%5Cdfrac%7B16-4%5Csqrt%7B15%7D%7D%7B4%7D%7D%5C%5C%20%5C%5C%20%5C%5C%0A%5Csin%20x%3D%5Cpm%20%5Csqrt%7B%5Csqrt%7B15%7D-3%7D" />

2)

<img src="https://tex.z-dn.net/?f=E%3D%28%5Csqrt%7B15%7D-3%29%28%5Csin%20x%2B%5Ccsc%20x%29%5E2%2B4%5Csqrt%7B15%7D%5C%5C%20%5C%5C%0AE%3D%28%5Csqrt%7B15%7D-3%29%28%5Csin%5E2%20x%2B%5Ccsc%5E2%20x%2B2%29%2B4%5Csqrt%7B15%7D%5C%5C%20%5C%5C%0AE%3D%28%5Csqrt%7B15%7D-3%29%5Cleft%28%5Csqrt%7B15%7D-3%2B%5Cdfrac%7B1%7D%7B%5Csqrt%7B15%7D-3%7D%2B2%5Cright%29%2B4%5Csqrt%7B15%7D%5C%5C%20%5C%5C%0AE%3D%2824-6%5Csqrt%7B15%7D%2B1%2B2%5Csqrt%7B15%7D-6%29%2B4%5Csqrt%7B15%7D%5C%5C%20%5C%5C%0A%5Cboxed%7BE%3D19%7D" />.