Question

What is the value of sec70°sin20°+cosec50°cos40°?

Answer 1

Answer:

2

Step-by-step explanation:

sinA = Cos(90° - A)

cosA = Sin(90° - A)

secA.cosA = 1  cosecA.sinA = 1  

sec70°sin20°+cosec50°cos40°

= sec70°.cos(90°-20°) + cosec50°.sin(90°-40°)

= sec70°.cos70° + cosec50°.sin50°  

= 1 + 1 = 2

Answer 2

Answer:

2

Step-by-step explanation:

concept of 90°

+ both sec 70° sin20°

we get 90

we can write 90 is 1 because (a+b) = 90° = 1

+ 50+40

1+1 = 2 answer