Question

if cos theta + cos square theta=1, sin8theta+ 2 sin square theta +sin 4theta=?​

Answer 1

Answer:

Answer:

Step-by-step explanation:

/* By algebraic identity:

i )a²+b² = (a+b)²-2ab

By Trigonometric identity:

ii) sin²A+cos²A = 1 */

Therefore,

Answer 2

Answer:

Answer:

Step-by-step explanation:

/* By algebraic identity:

i )a²+b² = (a+b)²-2ab

By Trigonometric identity:

ii) sin²A+cos²A = 1 */

Therefore,