Question

le right angle triangle ABC, right angle is at CBC
Com the finds and tan
Discuss
Discuss among your friends
@
does exist for some value of anglex?
The value of an and cos A is always less than 1. Why
tan A is product of tan and A
There are the more ratios defined in trigonometry which are cons​

Answer 1

ANSWER

By Pythagoras theorem,

AB

2

=AC

2

+BC

2

⇒AC

2

=AB

2

−BC

2

⇒AC

2

=29

2

−21

2

=(29+21)(29−21)=50×8

⇒AC

2

=25×16

⇒AC=5×4=20 units

⇒cosθ=

AB

BC

=

29

21

,

sinθ=

AB

AC

=

29

20

⇒sin2θ+cos

2

θ=

29

2

21

2

+20

2

=

29

2

29

2

=1

⇒cos

2

θ−sin

2

θ=

29

2

21

2

−20

2

=

841

41

.