Question

(i) The value of cos O cos(90°- 0 ) - sin o sin(90° - 0 ) is
A) 1
B) -1 C) 2
D)0​

Answer 1

Answer:

Lemonade is prepared by mixing lemon juice and sugar in water. you wish to add ice to cool it. should you add ice to the lemonade before or after dissolving sugar? in which would it be possible to dissolve more sugar ?

Answer 2

Answer:

0

Step-by-step explanation:

let LHS= cosO cos(90°- 0) - sinO sin(90° - 0)

now using

$cos(90-\alpha )=sin\alpha \\sin(90-\alpha )=cos\alpha$

therefore LHS =cos0sin0 -  sin0cos0

now using

$sin(0)=0\\cos(0)=1$

LHS= 1 * 0 - 0 * 1

=0=RHS