What is the simplified value of (cos4 A – sin4 A) ?

More Questions from Simplification

• If ab+c=bc+a=Cb+a then which one of the following statements is correct?
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• A 12 m long wire is cut into two pieces, one of which is bent into a circle and the other into a square enclosing the circle. What is the radius of the circle?
• Two equal circles intersect such that each passes through the centre of the other. If the length of the common chord of the circles is 10√3 cm, then what is the diameter of the circle?
• If the mean of m observations out of n observations is n and the mean of remaining observations is m, then what is the mean of all n observations?
• If x + y = 5, x3 + y3 = 35 , then what is the positive difference between x and y?
• If x = 2+32-3 , then what is the value of x2+x-9 ?
• If x+y+z = 0, then what is the value of x23z+y33xz+z23x ?

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