
Sin 4x/cos 3x+cosx -2 =0


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To solve the trigonometric equation , we'll follow these steps:
Step 1: Simplify the expression. Step 2: Get a common denominator. Step 3: Solve for . Step 4: Solve for .
Let's go through each step:
Step 1: Simplify the expression. Combine the fractions on the left side:
Step 2: Get a common denominator. The common denominator is . Rewrite the expression with this common denominator:
Step 3: Solve for . To do this, let's first multiply both sides by to eliminate the fraction:
Step 4: Solve for . Now, we need to use trigonometric identities to express in terms of so that we can solve for . Let's use the double angle identity for sine: .
Using this identity, we can rewrite as:
Next, use the double angle identity for cosine: .
Now, we can express in terms of :
Substitute this expression back into the previous equation for :
Next, use the double angle identity for sine again: .
This time, use it in reverse to express in terms of :
Substitute this expression back into the equation for :
Now, substitute this expression for back into the equation:
Now we have an equation involving and . To eliminate , we can use the identity , which implies .
Let's use this identity to express in terms of :
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