Question

4 cos ^3 45°- cos 45°+ sin 45°

Answer 1

Answer:

given, to evaluate 4 cos^3 45° - cos 45° + sin 45°

cos 45° = sin 45° = 1/√2

substituting the values in the given expression

=> 4 × (1/√2)^3 - 1/√2 + 1/√2

=> 4 × 1/(2√2) [ -1/√2 & 1/√2 cancels out ]

=> 4/2√2

=> 2/√2 × √2/√2 [ rationalise the denominator ]

=> (2√2)/2

=> √2 Answer

Answer 2

Answer:

hii..

Step-by-step explanation:

q. 4cos^3 45°-cos45°+sin45°

=4×(1/√2)^3-0

=4×1/2√2

=2/√2

=√2

your ans is.....√2

mark me as brainliest❤️