sec^2 65 - cot^2 25 -2sin30 cos60
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Answer:
See the pic below
Answered by
1
Concept:
We need to know few trigonometric equtions like the below:
If Cot x= Cot(90-y), then Cot x=Tan y
Given:
The following trigonometric equation is given:
To find:
We need to find the value of the given equation.
Solution:
Now, we know that
25°=90°-65°
Then
⇒
Therefore
⇒ [
]
⇒
⇒
Therefore the value of the trigonometric equation is
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