Question

$(1-{\sin }^2\theta )(1+{\tan }^2\theta )$ is equal to

• A. $1$
• B. $1.5$
• C. $2$
• D. $2.5$

Answer 1

Answer: (A)

$1$

$(1-{\sin }^2\theta )(1+{\tan }^2\theta )={\cos }^2\theta {\sec }^2\theta =1$