Final answer to the problem
Step-by-step Solution
How should I solve this problem?
- Prove from LHS (left-hand side)
- Prove from RHS (right-hand side)
- Express everything into Sine and Cosine
- Exact Differential Equation
- Linear Differential Equation
- Separable Differential Equation
- Homogeneous Differential Equation
- Integrate by partial fractions
- Product of Binomials with Common Term
- FOIL Method
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Starting from the left-hand side (LHS) of the identity
Apply the trigonometric identity: $\cos\left(a\right)-\cos\left(b\right)$$=-2\sin\left(\frac{a-b}{2}\right)\sin\left(\frac{a+b}{2}\right)$, where $a=a+b$ and $b=a-b$
Learn how to solve trigonometric identities problems step by step online.
$\cos\left(a+b\right)-\cos\left(a-b\right)$
Learn how to solve trigonometric identities problems step by step online. Prove the trigonometric identity cos(a+b)-cos(a-b)=-2sin(a)sin(b). Starting from the left-hand side (LHS) of the identity. Apply the trigonometric identity: \cos\left(a\right)-\cos\left(b\right)=-2\sin\left(\frac{a-b}{2}\right)\sin\left(\frac{a+b}{2}\right), where a=a+b and b=a-b. Simplify the product -(a-b). Cancel like terms a and -a.