Question

If cos x = cos 40°. Sin50° + sin 40°. cos 50°, then find the value of x.

Answer 1

Answer:

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Step-by-step explanation:

HEY!!

HERE IS YOUR ANSWER  

:-  

given Cosx =cos40°.sin50°+sin40°.cos50°

=cos(90°-50°).sin50°+sin(90°-50°).cos50°

=sin50°.sin50°+cos50°.cos50°

=sin^2 50°+ cos^2 50°

=1

Now,cos x = 1

cos x =cos 0°

x=0

Answer 2

we know that cos (x+y) = cos x.sin y + sin x. cos y

therefore , cos x = 90

(if there any mistake , then sorry , because I am just promoted to 9 standard )