Question

If alpha + beta = 90 degree, show that (sin alpha /cos alpha) - cot^2beta = 1​

Answer 1

Answer:

Correct option is A)

Given, α+β=90

and α=2β

⇒2β+β=90

⇒3β=90

⇒β=30

but α+β=90

∴α+30

=90

∴α=60

⇒cos

2α+sin

2β=cos

260 +sin 230

=( 21 ) 2+( 21 ) 2 = 21

Step-by-step explanation:

i hope this is help full