Question

if sinQ-cosQ=0 then prove that sin^4Q+cos^4Q=1

Answer 1

Answer:

Step-by-step explanation:

answer should be 1/2 and not 1.

Answer 2

Answer:

(A) 1/2

Step-by-step explanation:

SinQ - CosQ = 0

therefore, SinQ = CosQ

Hence, Q = 45°  (the value of sinQ and cos Q is same at 45°)

sin^4Q+cos^4Q

= (1/$\sqrt{2}$)^4  + (1/$\sqrt{2}$)^4

= 1/4 + 1/4

=1 / 2

Hence Proved

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