Introduction To Trigonometry
> Question
VSA
2 marks
Year: 2023
Medium
CBSE Class 10
trigonometry
identities
squaring
Question
If
sin
θ
+
cos
θ
=
3
, then find the value of
sin
θ
⋅
cos
θ
.
Solution
1
sin
θ
+
cos
θ
=
3
Squaring both sides:
sin
2
θ
+
cos
2
θ
+
2
sin
θ
cos
θ
=
3
+1 mark
2
⇒
1
+
2
sin
θ
cos
θ
=
3
+0.5 marks
3
⇒
sin
θ
cos
θ
=
1
+0.5 marks
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