Question

What is the formula for cosc-cosd

Answer 1

cosc-cosd =2Sin[(C+D)/2]*Sin[(D-C)/2]

hope it will help u

Answer 2

The formula for cosc-cosd is $-2\sin (\dfrac{c-d}{2})\sin (\dfrac{c+d}{2})$.

Step-by-step explanation:

We need to find the formula for cosc-cosd.

The required formula is:

$\cos A-\cos B=-2\sin (\dfrac{A-B}{2})\sin (\dfrac{A+B}{2})$

Substitute A=c and B=d in the above formula.$\cos c-\cos d=-2\sin (\dfrac{c-d}{2})\sin (\dfrac{c+d}{2})$

Therefore, the formula for cosc-cosd is $-2\sin (\dfrac{c-d}{2})\sin (\dfrac{c+d}{2})$.

#Learn more

Formulas of trigonometry:

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