Date
Prove that sintheta sec theta+costheta cosec theta=
2 cosec 2theta​

See Below.

Step-by-step explanation:

We want to prove that:

Let secθ = 1 / cosθ and cscθ = 1 / sinθ:

Creat a common denominator. Multiply the first fraction by sinθ and the second by cosθ. Hence:

Combine fractions:

Simplify. Recall that sin²θ + cos²θ = 1:

Multiply the fraction by two:

Recall that sin2θ = 2sinθcosθ. Hence:

By definition:

Hence proven.

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)

their is no graph showing

step-by-step explanation: