Sin2xsecx = 2sinx

How do you prove this is an identity?

Solution:

To prove that .

Let us take LHS which is equal to RHS.

Using basic trigonometric identity:

Using trigonometric identity:

Cancel both cosθ in the numerator and denominator.

LHS = RHS

Hence proved.

answer: i believe its b. if you sound out the sentences that sounds wrong.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer