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NCERT Class XI Mathematics - Trigonometric Functions - Solutions

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Question : 18
Total: 61
sin2
π
6
+cos2
π
3
−tan2
π
4
 = -
1
2
Solution:  
L.H.S = sin2
π
6
+cos2
π
3
−tan2
π
4
= [(
1
2
)2+(
1
2
)2−(1)2] =
1
4
+
1
4
 - 1 = −
1
2
 = R.H.S
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