11.
11. Find the value of x (0°<x<90°) in
tan 3x = sin 45ºcos 45º+sin 30
Answers
Answered by
0
Step-by-step explanation:
R.H.S
sin45⋅cos45
o
+sin30
=
2
1
.
2
1
+
2
1
=
2
1
+
2
1
=
2
2
=1
Now,
L.H.S
tan3x=1
But tan45
o
=1
∴tan3x=tan45
⇒3x=45
⇒x=
3
45
∴x=15
Answered by
3
tan 3x = sin 45° cos 45° + sin 30°
⇒ tan 3x = 1/√2 × 1/√2 + 1/2
⇒ tan 3x = 1/2 + 1/2
⇒ tan 3x = 1
⇒ tan 3x = tan 45°
⇒ 3x = 45°
⇒ x = 15°
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