Plz help due today this is one question plz show work

Mathematics

1 answer:

Assoli18 [71]3 years ago

5 0

Answer:

a. -1/2

b. sq rt 2 / 2

c. -1

d. sq rt 3 / 2

e. -1

f. -pi/6

Step-by-step explanation:

you use the trig values table

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Help me make it simple C=cos25°cos35°-cos65°cos85°

nikdorinn [45]

Answer:

It invaluatesa to 1

Step-by-step explanation:

sin25 ∘cos65 ∘+cos25 ∘sin65 ∘=sin25

∘ sin(90 ∘−65 ∘)+cos25

∘cos(90 ∘−65 ∘ )

=sin25 ∘

sin25 ∘ +cos25 ∘cos25 ∘

=sin 2 25 ∘+cos 2 25 ∘=1

hope this helped you!

4 0

3 years ago

Complete the two-column proof by providing a reason for each of the five statements. Given: Rectangle R U T S Prove: ∠ U S R = ∠

Fantom [35]

Answer:

The two column proof can be presented as follows;

Statement ${}$ Reason

1. RUST is a rectangle ${}$ Given

2. RU = ST ; UT = RS ${}$ Definition of a rectangle

3. ∠STU and ∠SRU are right angles ${}$ Definition of a rectangle

4. ΔURS ≅ ΔSTU ${}$ By SAS rule of congruency

5. ∠USR = ∠SUT ${}$ By CPCTC

Step-by-step explanation:

Given that the side RU, the angle ∠SRU and the side RS of triangle ΔURS are congruent to the side ST the angle ∠STU and the side UT of triangle ΔSTU, then ΔURS is congruent to ΔSTU, by the Side-Angle-Side (SAS) rule of congruency

Therefore, we have that ∠USR ≅ ∠SUT and therefore, it can be shown that ∠USR = ∠SUT using the Congruent Parts of Congruent Triangle are Congruent (CPCTC) postulate.