Trigonometric Ratios CBSE NCERT Solutions Chapter 8 Exercise 8.1 Question 7
7. If cot
, evaluate:
(i) (1+sin
) (1-sin
) /(1+cos
)(1- cos
)
(ii)
Solution:
We can directly solve first part:
(1+sin
) (1-sin
) /(1+cos
)(1- cos
) {
}
OR
It is given that cot
cot
= (Side Adjacent to
) / (Side Opposite to angle
)
Let BC = 7k and AB = 8k as we are given that
Using Pythagoras Theorem on
, we get
sin
cos
(1+sin
) (1-sin
) /(1+cos
)(1- cos
)
= (
(ii)
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