11th Class Math MCQS Chapter 9

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11th Class Math MCQS


cot4? +cot2? = _______
cosec2? + cot2?
cosec4? +cosec2?
cosec4? -cosec2?
None of these

If a cost ?+bcsc ?= x2 and bcot ? + = y2 then x4 -y4 =
b2-a2
a2-b2
a2 +b2
b – a

If cos20 = a sin2? -2/a than a = ?
1
2
-1
-2

In 4rd quadrant all trigonometric ratios are negative except
cos0,sec0
Sin0
tan0,cot0
Sin0,cosec0

1 + tan2 0 is equal to
cosec2 0
sec2 0
cos2 0
cot2 0
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