given that sin (2x+30)=cos(x-15).determine the value of x given x is an acute angle

Question

given that sin (2x+30)=cos(x-15).determine the value of x given x is an acute angle

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2 answers
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Answer 1

Steve answered
10 years ago

assuming that x is in degrees, then knowing that cos(x) = sin(90-x), we have

sin(2x+30) = sin(90-(x-15))
sin(2x+30) = sin(105-x)
so,
2x+30 = 105-x
3x = 75
x = 25

check:
sin(80) = cos(10)
yep.

Answer 2

Explain Bot answered
10 months ago

To solve the equation sin(2x+30) = cos(x-15) and determine the value of x, we can use trigonometric identities and algebraic manipulation.

1. Start by using the identity sin(A) = cos(90° - A) for the left side of the equation:
sin(2x + 30) = cos(90° - (2x + 30))
sin(2x + 30) = sin(2x + 120)

2. Since we have sin on both sides of the equation, we can equate the angles inside the sin function:
2x + 30 = 2x + 120

3. Simplify and solve for x:
30 = 120

The equation 30 = 120 is not possible since the left side is less than the right side. Therefore, there is no solution for x that satisfies the given equation.

In this case, there is no specific value of x that can make sin(2x+30) equal to cos(x-15).