How do you simplify #f(theta)=sec(theta/4)-cos(theta/4-pi/2)# to trigonometric functions of a unit #theta#?
In order to simplify what we have here, we have to use the Half-Angle identities and Sum and Difference formula.
The Half-Angle identities state that
Let us keep simplifying the second part of the function;
We must have
And vice versa.
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To simplify ( f(\theta) = \sec(\frac{\theta}{4}) - \cos(\frac{\theta}{4} - \frac{\pi}{2}) ) to trigonometric functions of a unit theta, we use the following trigonometric identities:
- ( \sec(x) = \frac{1}{\cos(x)} )
- ( \cos(a - b) = \cos(a)\cos(b) + \sin(a)\sin(b) )
Substituting these identities into ( f(\theta) ), we get:
( f(\theta) = \frac{1}{\cos(\frac{\theta}{4})} - (\cos(\frac{\theta}{4})\cos(\frac{\pi}{2}) + \sin(\frac{\theta}{4})\sin(\frac{\pi}{2})) )
Since ( \cos(\frac{\pi}{2}) = 0 ) and ( \sin(\frac{\pi}{2}) = 1 ), we can simplify further:
( f(\theta) = \frac{1}{\cos(\frac{\theta}{4})} - \sin(\frac{\theta}{4}) )
Now, to express this in terms of a unit theta, we let ( u = \frac{\theta}{4} ), so ( \theta = 4u ):
( f(u) = \frac{1}{\cos(u)} - \sin(u) )
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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