Question

show that cos 2 (45 + theta) + cos 2 (45 - theta) = tan (60 + theta) tan (30 - theta)

Answer 1

Answer:

Step-by-step explanation:

Cos∅ cos ( 90 - ∅ ) - sin∅ sin ( 90 - ∅ )

=> Sin∅ = cos ( 90 - ∅ )

=> Cos∅ = sin ( 90 - ∅ )

Cos∅ Sin∅ - Sin∅ Cos∅

= 0