# 11th Class Math MCQS Chapter 10

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If r cos ? = 3, r sin ? = 4 then r is
25
5
-5
-25

Sin(90o -a) =
-cosa
cosa
sina
-sina

If x > y > o then point p(x,y) lies in quadrmt:
I
II
IV
III

Sin3? =
3sin? – 4Sin3?
4 Sin3 ?-3Sin?
3Sin? -4Sin3?
4 Sin3? + 3Sin?

If ?,? ? are angles of triangle then cos (?+ ?) = ________
-cos ?
cos?
sin ?
sin ?/2

Sin ? =
2sin?/a cos ?/2
1
cos2 ? – sin2 ?/2
sin ?/2 cos ?/2

The sum of all angles of the triangle are
270o
180o
90o
360o

All trigonometric ratios are positive in
3rd quadrant
2nd quadrant
4th quadrant
1st quadrant

Sin p + sin Q =
2sin P + Q/2 cos P -Q/2
-2 sin P+Q/2. sin P- Q /2
None of these
2 cos P+Q/2. cos P – Q/2

tan(-a)=
tana
cota
-cota
-tana

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