When sec theta=1.75, sin theta=√33/7 , show me how you get this answer?

Sec is reciprocal of cos.
Sec 1.75 changed to improper fraction 7/4.
Cos theta is 4/7.
Sin is adjacent/hypotenuse
Use Pythagorean theorem to find the missing side of the triangle
4^2+b^2=7^2
b^2=49-16
b= sqrt33
Sin theta = (sqrt33)/7

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,