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Byju's Answer
Standard X
Mathematics
Range of Trigonometric Ratios from 0 to 90 Degrees
Verify the fo...
Question
Verify the following equalities.
cos
90
∘
=
1
−
2
sin
2
45
∘
=
2
cos
2
45
∘
−
1
Open in App
Solution
cos
90
°
=
0
,
1
−
2
sin
2
45
°
=
1
−
2
(
1
√
2
)
2
=
1
−
1
=
0
⇒
2
cos
2
45
°
−
1
=
2
×
(
1
√
2
)
2
−
1
=
1
−
1
=
0
∴
cos
90
°
=
1
−
2
sin
2
45
°
=
2
cos
2
45
°
Hence, the answer is verified.
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Standard X Mathematics
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