Question

Find the value of , if = -1/2

and lies in 2nd

quadrant. ​

Answer 1

Answer:

this is your answer

Step-by-step explanation:

tanA=−

3

4

and \sin ce A lies in 2

nd

quadrant,

cosA=−ive and sinA=+ive

secA=±

1−tan

2

A

=±

3

5

∴ cosA=−

5

3

sinA=±

1−cos

2

A

=±

5

4

∴ sinA=

5

4

∴ E=2(−

4

3

)−5(−

5

3

)+

5

4

=−

2

3

+3+

5

4

=

2

3

+

5

4

=

10

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