Angles α and β are the two acute angles in a right triangle. Use the relationship between sine and cosine to find the value of β

Question

valina [46]

4 years ago

11

Angles α and β are the two acute angles in a right triangle. Use the relationship between sine and cosine to find the value of β

if β < α.
sin(7x − 15) = cos(3x + 5)

Mathematics

2 answers:

Karolina [17] · Answer 1 · 2021-12-05T13:47:12+03:00

Karolina [17]4 years ago

4 0

35 is the answer .................................

NARA [144] · Answer 2 · 2021-12-05T12:14:46+03:00

We know that
in a right triangle
if sin A= cos B
then
angle A and angle B are complementary angles
so A+B=90

therefore
(7x-15)+(3x+5)=90-----> 10x-10=90----> 10x=100----> x=10°
so
7x-15------> 7*10-15----> 55°
3x+5------> 3*10+5----> 35°

we know that
<span>β < α
therefore

the answer is
</span>β =35°
<span>α=55</span>°