Question

If tan theta is equal to root 2 minus 1 prove that sin theta into cos theta is equal to 1 by 2 root 2

Answer 1

Step-by-step explanation:

Hope it will help u

Answer 2

Answer:

Solution : -

tanA=

2

−1

we know tanA=

B

P

=

1

2

−1

∴H=

(

2

−1)

2

+1

2

=

4−2

2

∴sinA=

4−2

2

2

−1

cosA=

4−2

2

1

∴sinAcosA=

4

−2

2

2

−1

×

4−2

2

1

=

4−2

2

2

−1

=

4−2

2

2

−1

×

4+2

2

4+2

2

=

16−8

4

2

+4−4−2

2

=

8

2

2

=

4

2