Question
Download Solution PDFIf sin Y = x, then what will be the value of cos 2Y (where 0 ≤ Y ≤ 90°)?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
sin Y = x
Formula used:
cos 2Y = 1 - 2sin2 Y
Calculations:
According to the question,
⇒ cos 2Y = 1 - 2sin2 Y
⇒ cos 2Y = 1 - 2(sin Y)2
⇒ cos 2Y = 1 - 2(x)2
∴ The value of cos 2Y is 1 - 2(x)2.
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