Question

if 2cos²A.sinA-2=0 find A​

Answer 1

Answer:

sinA−cosA=0

⇒A=cosA

⇒tanA=1

⇒A=

4

π

sin

4

A+cos

4

A=sin

4

4

π

+cos

4

4

π

=(

2

1

)

4

+(

2

1

)

4

=

4

1

+

4

1

=

2

1

.