3 years ago

Use double angle formulas to find the exact value of sin2x,cos2x, and tan2x

1 answer:

5 0

Sin2x = 2sinxcosx;
cos2x = (cosx)^2 - (sinx)^2;
tan2x = (sin2x)/(cos2x);

cosx = 5/13 from formula (sinx)^2 + (cosx)^2 = 1;

=> sin2x = 120/169;
.................................

You might be interested in

PLEASE HELP!! I’m very confuse

SVETLANKA909090 [29]

Given:

A(16, 4)

B(34, 40)

Line segment AB partition in the ratio 1 : 5.

To find:

The coordinate of a point that partitions AB.

Solution:

Section formula:

$$P(x,y)=\left(\frac{m x_{2}+n x_{1}}{m+n}, \frac{m y_{2}+m y_{1}}{m+n}\right)$

Here $x_1=16, y_1=4, x_2=34, y_2=40$ and m = 1, n = 5

$$P(x,y)=\left(\frac{1\times 34+5 \times 16}{1+5}, \frac{1\times 40+5 \times4}{1+5}\right)$

$$P(x,y)=\left(\frac{ 34+80}{6}, \frac{40+20}{6}\right)$

$$P(x,y)=\left(\frac{ 114}{6}, \frac{60}{6}\right)$

$$P(x,y)=(19, 10)$

The coordinate of point that partitions the segment AB is (19, 10).

4 0

4 years ago

An item is regularly priced at $90 . leila bought it at a discount of 60% off the regular price. how much did leila pay?

forsale [732]

90(.4) = 36

Leila payed $36

3 0

4 years ago

a coin is tossed. find the probability of the coin landing on heads. write your answer as a fraction, percent, and decimal

inysia [295]

Since there are only two sides (heads & tails) to a coin:
Probability (as fraction) - 1/2
Probability (as percent) - 1/2 x 100 = 50%
Probability (as decimal) - 1 x 50/2 x 50 = 50/100 = 0.5

(P.S. Please mark this answer as the brainliest answer... Thank You)

6 0

3 years ago

Read 2 more answers

If x is Equal to 7, what is 7 divided by 3 and round it up

VikaD [51]

Answer:

2.3 or 2

Step-by-step explanation:

7 0

3 years ago

15. Work out the<br> area of a<br> rectangle with<br> sides 3.4cm and<br> 4.5cm

pav-90 [236]