Evaluate sin27° sin63° - cos63° cos27° - Vidyadip

Question

Evaluate
sin27° sin63° - cos63° cos27°

✓

Answer

sin27° sin63° - cos63° cos27°
= sin(90° - 63°) sin63° - cos63° cos(90° - 63°)
= cos63° sin63° - cos63° sin63°
= 0

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[2 Mark Question Answer]" from Trigonometrical Identities→Trigonometrical Identities — all question types→Mathematics STD 10 question papers→ICSE Board STD 10 question papers→ICSE Board question paper generator→

Similar questions

Without solving the following quadratic equation, find the value of ‘p’ for which the given equations have real and equal roots: $px^2 – 4x + 3 = 0$

Find the duplicate ratio of the following :
$\sqrt{10}: \sqrt{14}$

Solve for x : 6 - 10x < 36, x ∈ {-3, -2, -1, O, 1, 2}

Prove. $ 2 \sin^2A + \cos^4A = 1 + \sin^4A$

Mrs Mathew opened a Recurring Deposit Account in a certain bank and deposited $₹ 640$ per month for $4^{1/2}$ years. Find the maturity value of this account, if the bank pays interest at the rate of $12\%$ per year.

Draw a cumulative frequency curve (ogive) for the following distributions:

Class Interval	10 – 15	15 – 20	20 – 25	25 – 30	30 – 35	35 – 40
Frequency	10	15	17	12	10	8

If $A$ and $B$ are complementary angles, prove that: $\cot A \cot B - \sin A \cos B - \cos A \sin B = 0$

One card is drawn from a well shuffled deck of 52 cards. Find the probability of getting: a black face card

Solve and graph the solution set of $:x + 5 ≥ 4(x - 1)$ and $3 - 2x < -7 ; x \in R .$

Solve the following inequalities and represent the solution on a number line :
2x + 3 < 5