Question

f 4 cos^2 tettha -1 = 0 and 0 ≤ xº ≤ 90º find i) sin^2 tettha + cos^2 tettha ii) 1/cos^2 xº - tan^2 xº

Answer 1

Answer:

4cos

2

x

∘

−1=0

cos

2

x

∘

=

4

1

cosx

∘

=

2

1

cosx

∘

=cos60

∘

x=60

∘