Use the fundamental identities and appropriate algebraic operations to simplify the following expression.
left parenthesis 7 plus tangent x right parenthesis left parenthesis 7 minus tangent x right parenthesis plus secant squared x

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?