Question

cot A tan A
a- tan A
b- sec A
c- 1
d- cot A​

Answer 1

Question :

• Evaluate cot A . tan A

Solution :

$\large\tt \implies\cot A. \tan A\\ \\ \large\tt \implies \frac{ \cos A}{ \sin A} \times \frac{ \sin A}{\cos A} \\ \\ \large \tt \implies1$

$\large\bf \underline{Option \: c \: is \: correct \: answer}$

Important identities :

• tan θ = sin θ / cos θ

• cotθ = cosθ / sin θ

• cos²θ + sin²θ = 1

• sin²θ = 1 − cos²θ

• cos²θ = 1 − sin²θ

• 1 + tan²θ = sec²θ

• cot²θ + 1 = csc²θ

Answer 2

Answer:

c - 1

Step-by-step explanation:

cotA • tanA

cosA/sinA × sinA/cosA

= 1

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