Math, asked by bhavyagarg2639, 9 months ago

Cos25°.cos65°-sin65°.cos65°

Answers

Answered by majesty10

0

Answer:

THE ATTACHMENT WILL HELP YOU

Attachments:

Answered by asazmi21

0

Answer:

Note:

CosA *CosB -SinA *SinB , and, CosA =Sin(90-A), so Cos(65)=Sin(90-65) =Sin25,

Therefore,

Cos25 *Cos65 -Sin65 *Cos65=Cos25 *Cos65 -Sin65 *Sin(90-65)

=Cos25*Cos65 -Sin25 *Sin65= Cos(25+65)=Cos90=0,

Previous Question

Next Question

Similar questions

Math, 4 months ago

Find the mean proportion in the following: 1.25, 0.45...

Math, 4 months ago

If the perimeter of a semi circular park is 180 m, Find its Area ...

Physics, 4 months ago

a wind blows steadily at 90° to a yacht sail of area 3.8 m^2. the velocity of the wind is 20 ms^-1. show that the mass of air hitting the sail each second is approximately 90kg. the density of air is 1.2 kgm^-3...

Math, 9 months ago

दो संख्याओ का गुड़फल 600 है यदि उसका लग्घुत्तम समपवर्त्य 60 है तो उसका महत्तम समपवर्त्य क्या होगा?

Math, 9 months ago

Find the side of a square in my if it's area is 121 cm2...

Math, 1 year ago

Co-ordinate of point P on a number line is - 7. Find the co-ordinates of points on thenumber line which are at a distance of 8 units from point P. Please give me answer fast.

History, 1 year ago

How non-cooperation came to an end...

English, 1 year ago

type of poem is the. world a stage...