1. sin(2x + 4) = cos(3x + 21) 2. cos(20+15) = sin(10+30)
3. sin(5x - 10) = cos(4x + 28)
4. sin(8X) + cos(x) = 2cos(x)

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.

d.) yes, because the volume of the cone is greater than the volume of the sphere

step-by-step explanation:

the answer is c hope this